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Korenivski, Vladislav, ProfessorORCID iD iconorcid.org/0000-0003-2339-1692
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Publications (10 of 122) Show all publications
Iurchuk, V., Kozlov, O., Sorokin, S., Zhou, S., Lindner, J., Reshetniak, S., . . . Korenivski, V. (2023). All-Electrical Operation of a Curie Switch at Room Temperature. Physical Review Applied, 20(2), Article ID 024009.
Open this publication in new window or tab >>All-Electrical Operation of a Curie Switch at Room Temperature
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2023 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 20, no 2, article id 024009Article in journal (Refereed) Published
Abstract [en]

We present all-electrical operation of a FexCr1-x-based Curie switch at room temperature. More specifically, we study the current-induced thermally driven transition from ferromagnetic to antiferromagnetic Magnetometry measurements at different temperatures show that the transition from the ferromagnetic to the antiferromagnetic coupling at zero field is observed at approximately 325 K. Analytical modeling confirms that the observed temperature-dependent transition from indirect ferromagnetic to indirect antiferromagnetic interlayer exchange coupling originates from the modification of the effective interlayer exchange constant through the ferromagnetic-to-paramagnetic transition in the Fe17.5Cr82.5 spacer with minor contributions from the thermally driven variations of the magnetization and magnetic anisotropy of the Fe layers. Room-temperature current-in-plane magnetotransport measurements on the patterned Fe/Cr/Fe17.5Cr82.5/Cr/Fe strips show the transition from the "low-resistance" parallel to the "highresistance" antiparallel remanent magnetization configuration, upon increased probing current density. Quantitative comparison of the switching fields, obtained by magnetometry and magnetotransport, confirms that the Joule heating is the main mechanism responsible for the observed current-induced resistive switching.

Place, publisher, year, edition, pages
American Physical Society (APS), 2023
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-336002 (URN)10.1103/PhysRevApplied.20.024009 (DOI)001052061400002 ()2-s2.0-85168733421 (Scopus ID)
Note

QC 20230911

Available from: 2023-09-11 Created: 2023-09-11 Last updated: 2023-09-11Bibliographically approved
Polishchuk, D., Tykhonenko Polishchuk, Y., Lytvynenko, Y. M., Rostas, A. M., Kuncser, V., Kravets, A., . . . Korenivski, V. (2023). Antiferromagnet-mediated interlayer exchange: Hybridization versus proximity effect. Physical Review B, 107(22), Article ID 224432.
Open this publication in new window or tab >>Antiferromagnet-mediated interlayer exchange: Hybridization versus proximity effect
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2023 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 107, no 22, article id 224432Article in journal (Refereed) Published
Abstract [en]

We investigate the interlayer coupling between two thin ferromagnetic (F) films mediated by an antiferromagnetic (AF) spacer in F∗/AF/F trilayers and show how it transitions between different regimes on changing the AF thickness. Employing layer-selective Kerr magnetometry and ferromagnetic-resonance techniques in a complementary manner enables us to distinguish between three functionally distinct regimes of such ferromagnetic interlayer coupling. The F layers are found to be individually and independently exchange-biased for thick FeMn spacers - the first regime of no interlayer F-F∗ coupling. F-F∗ coupling appears on decreasing the FeMn thickness below 9 nm. In this second regime found in structures with 6.0-9.0-nm-thick FeMn spacers, the interlayer coupling exists only in a finite temperature interval just below the effective Néel temperature of the spacer, which is due to magnon-mediated exchange through the thermally softened antiferromagnetic spacer, vanishing at lower temperatures. The third regime, with FeMn thinner than 4 nm, is characterized by a much stronger interlayer coupling in the entire temperature interval, which is attributed to a magnetic-proximity induced ferromagnetic exchange. These experimental results, spanning the key geometrical parameters and thermal regimes of the F∗/AF/F nanostructure, complemented by a comprehensive theoretical analysis, should broaden the understanding of the interlayer exchange in magnetic multilayers and potentially be useful for applications in spin thermionics.

Place, publisher, year, edition, pages
American Physical Society (APS), 2023
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-334620 (URN)10.1103/PhysRevB.107.224432 (DOI)001083447300002 ()2-s2.0-85164020824 (Scopus ID)
Note

QC 20230823

Available from: 2023-08-23 Created: 2023-08-23 Last updated: 2023-11-07Bibliographically approved
Polishchuk, D., Persson, M., Kulyk, M., Baglioni, G., Ivanov, B. A. & Korenivski, V. (2023). Oscillatory exchange bias controlled by RKKY in magnetic multilayers. Applied Physics Letters, 122(6), 062405, Article ID 062405.
Open this publication in new window or tab >>Oscillatory exchange bias controlled by RKKY in magnetic multilayers
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2023 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 122, no 6, p. 062405-, article id 062405Article in journal (Refereed) Published
Abstract [en]

Ferromagnetic/antiferromagnetic bilayers are interfaced with normal metal/ferromagnetic bilayers to form F*/AF/N/F valves. The N-spacer thickness is chosen such that it mediates strong indirect exchange [Ruderman-Kittel-Kasuya-Yosida (RKKY)] between the outer ferromagnetic layers, which varies in strength/direction depending on the N thickness and changes its direction on switching F. The system exhibits a strong modulation of the F*/AF exchange bias, oscillating in strength synchronously with the oscillation in the interlayer RKKY exchange across the normal metal spacer. The effect is explained as due to a superposition taking place within the antiferromagnetic layer of the direct-exchange proximity effect from the F*/AF interface and the indirect RKKY exchange from F penetrating AF via N. The modulation, expressed via the strength of the F*/AF bias field, reaches 400% at the first RKKY peak.

Place, publisher, year, edition, pages
AIP Publishing, 2023
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-324783 (URN)10.1063/5.0133125 (DOI)000931235100002 ()2-s2.0-85147731823 (Scopus ID)
Note

QC 20230316

Available from: 2023-03-16 Created: 2023-03-16 Last updated: 2023-03-16Bibliographically approved
Borynskyi, V. Y., Polishchuk, D., Savina, Y. O., Pashchenko, V. O., Kravets, A., Tovstolytkin, A. I. & Korenivski, V. (2023). Thermomagnetic transition in nanoscale synthetic antiferromagnets Py/NiCu/Py. Low temperature physics (Woodbury, N.Y., Print), 49(7), 863-869
Open this publication in new window or tab >>Thermomagnetic transition in nanoscale synthetic antiferromagnets Py/NiCu/Py
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2023 (English)In: Low temperature physics (Woodbury, N.Y., Print), ISSN 1063-777X, E-ISSN 1090-6517, Vol. 49, no 7, p. 863-869Article in journal (Refereed) Published
Abstract [en]

Using the method of SQUID magnetometry, the features of the antiferromagnet-ferromagnet thermomagnetic transition in arrays of the nanosized disks of Py/NiCu/Py synthetic antiferromagnets (SAFs) have been investigated. The effective interlayer interaction in individual SAFs “ferromagnet/diluted ferromagnet/ferromagnet” (F2/f/F1) changes from high-temperature antiferromagnetic to low-temperature ferromagnetic upon the transition at the Curie temperature T C f of the interlayer f. Temperature dependence of the magnetic parameters of individual layers and their effect on the features of the thermomagnetic transition are determined. The observed properties are important for the development of temperature-controlled nanoscale SAFs and multilayer nanostructures based on them.

Place, publisher, year, edition, pages
AIP Publishing, 2023
Keywords
blocked state., magnetometry, nanoparticles, phase transition, synthetic antiferromagnet, temperature switching
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-333880 (URN)10.1063/10.0019699 (DOI)001035360800014 ()2-s2.0-85165418406 (Scopus ID)
Note

QC 20230815

Available from: 2023-08-15 Created: 2023-08-15 Last updated: 2023-08-24Bibliographically approved
Kulyk, M., Persson, M., Polishchuk, D. & Korenivski, V. (2022). Magnetocaloric effect in multilayers studied by membrane-based calorimetry. Journal of Physics D: Applied Physics, 56(2), 025002-025002
Open this publication in new window or tab >>Magnetocaloric effect in multilayers studied by membrane-based calorimetry
2022 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 56, no 2, p. 025002-025002Article in journal (Refereed) Published
Abstract [en]

We study magnetic multilayers, incorporating dilute ferromagnetic spacers between strongly-ferromagnetic layers exhibiting a proximity-enhanced magnetocaloric effect (MCE). Using magnetometry and direct measurements of the adiabatic temperature change based on a nanomembrane-calorimetry, we find that the MCE in the studied multilayer is indeed enhanced compared to that in the bulk spacer material. We develop a phenomenological numerical model of the studied trilayer and find that a long-range exchange interaction through the weakly-ferromagnetic spacer is required to adequately describe the magnetic and magnetocaloric properties of the system.

Place, publisher, year, edition, pages
IOP Publishing, 2022
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-322814 (URN)10.1088/1361-6463/aca67f (DOI)000894148500001 ()2-s2.0-85144600643 (Scopus ID)
Funder
Swedish Research Council, VR 2018-03526Olle Engkvists stiftelse, 207-0460
Note

QC 20230404

Available from: 2023-01-05 Created: 2023-01-05 Last updated: 2023-04-04Bibliographically approved
Persson, M., Kulyk, M., Kravets, A. & Korenivski, V. (2022). Proximity-enhanced magnetocaloric effect in ferromagnetic trilayers. Journal of Physics: Condensed Matter, 35(7), 075801-075801
Open this publication in new window or tab >>Proximity-enhanced magnetocaloric effect in ferromagnetic trilayers
2022 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 35, no 7, p. 075801-075801Article in journal (Refereed) Published
Abstract [en]

The demagnetization and associated magnetocaloric effect (MCE) in strong-weak-strong ferromagnetic trilayers, upon a reorientation of the strong ferromagnets from parallel to antiparallel (AP) magnetization, is simulated using atomistic spin dynamics. The simulations yield non-trivial spin distributions in the AP state, which in turn allows entropy to be calculated directly. The influence of longer-range spin–spin interactions and of variable strength of the external switching field are investigated. Finally, we find that the MCE in the system can be significantly improved by allowing the local exchange to vary through the spacer, which in practice can be implemented by spatially tailoring the spacer's magnetic dilution.

Place, publisher, year, edition, pages
IOP Publishing, 2022
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-322813 (URN)10.1088/1361-648x/ac9f95 (DOI)000898312900001 ()36323000 (PubMedID)2-s2.0-85144366813 (Scopus ID)
Funder
Swedish Research Council, 2018-03526Olle Engkvists stiftelse, 2020-2022
Note

QC 20230404

Available from: 2023-01-05 Created: 2023-01-05 Last updated: 2023-04-04Bibliographically approved
Borynskyi, V., Kravets, A., Polishchuk, D., Tovstolytkin, A., Sharai, I., Korenivski, V. & Melnyk, A. (2022). Spin-wave Resonance in Arrays of Nanoscale Synthetic-antiferromagnets. In: Proceedings of the 2022 IEEE 12th International Conference "Nanomaterials: Applications and Properties", NAP 2022: . Paper presented at 12th IEEE International Conference "Nanomaterials: Applications and Properties", NAP 2022, Krakow, Poland, 11-16 September 2022. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Spin-wave Resonance in Arrays of Nanoscale Synthetic-antiferromagnets
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2022 (English)In: Proceedings of the 2022 IEEE 12th International Conference "Nanomaterials: Applications and Properties", NAP 2022, Institute of Electrical and Electronics Engineers (IEEE) , 2022Conference paper, Published paper (Refereed)
Abstract [en]

The study concerns dynamics of standing spin waves in arrays of sub-100 nm elliptic synthetic-antiferromagnet (SAF) nanodisks. We performed a detailed ferromagnetic resonance analysis in conjunction with micro magnetic modeling to find out several prominent traits of such systems. One broad line is shown to be the sole resonant response for a SAF of the considered sizes. We demonstrate that this mode is degenerated, and its excitation map resembles a superposition of in-center and edge-type oscillations. We also show how this hybrid excitation leads to almost twofold enhancement in the shape-induced anisotropy of the mode.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2022
Keywords
degenerate mode, ferromagnetic resonance, shape anisotropy, spin waves, synthetic antiferromagnets
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-329623 (URN)10.1109/NAP55339.2022.9934337 (DOI)2-s2.0-85142845151 (Scopus ID)
Conference
12th IEEE International Conference "Nanomaterials: Applications and Properties", NAP 2022, Krakow, Poland, 11-16 September 2022
Note

QC 20230622

Available from: 2023-06-22 Created: 2023-06-22 Last updated: 2023-06-22Bibliographically approved
Borynskyi, V. Y., Polishchuk, D., Melnyk, A. K., Kravets, A., Tovstolytkin, A. ,. & Korenivski, V. (2021). Higher-order ferromagnetic resonances in periodic arrays of synthetic-antiferromagnet nanodisks. Applied Physics Letters, 119(19), Article ID 192402.
Open this publication in new window or tab >>Higher-order ferromagnetic resonances in periodic arrays of synthetic-antiferromagnet nanodisks
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2021 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 119, no 19, article id 192402Article in journal (Refereed) Published
Abstract [en]

We investigate spin dynamics in nanodisk arrays of synthetic-antiferromagnets (SAF) made of Py/NiCu/Py trilayers, where the NiCu spacer undergoes a Curie transition at about 200 K. The observed ferromagnetic resonance spectra have three distinct resonance modes at room temperature, which are fully recreated in our micromagnetic simulations, showing also how the intra-SAF asymmetry can be used to create and control the higher-order resonances in the structure. Below the Curie temperature of the spacer, the system effectively transitions into a single-layer nanodisk array with only two resonance modes. Our results show how multilayering of nanoarrays can add tunable GHz functionality relevant for such rapidly developing fields as magnetic metamaterials, magnonic crystals, arrays of spin-torque oscillators, and neuromorphic junctions.

Place, publisher, year, edition, pages
AIP Publishing, 2021
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-305634 (URN)10.1063/5.0068111 (DOI)000721489800010 ()2-s2.0-85118992483 (Scopus ID)
Note

QC 20211206

Available from: 2021-12-06 Created: 2021-12-06 Last updated: 2022-06-25Bibliographically approved
Polishchuk, D., Polek, T. ,., Borynskyi, V. Y., Kravets, A. F., Tovstolytkin, A. ,. & Korenivski, V. (2021). Isotropic FMR frequency enhancement in thin Py/FeMn bilayers under strong magnetic proximity effect. Journal of Physics D: Applied Physics, 54(30), Article ID 305003.
Open this publication in new window or tab >>Isotropic FMR frequency enhancement in thin Py/FeMn bilayers under strong magnetic proximity effect
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2021 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 54, no 30, article id 305003Article in journal (Refereed) Published
Abstract [en]

Exchange biasing in ferromagnet/antiferromagnet bilayers is known to enhance the material's ferromagnetic resonance frequency and make it strongly angle dependent due to the unidirectional anisotropy induced at the interface. We observe a ten-fold enhancement in frequency and angle-independent ferromagnetic resonance in bilayers of Py/FeMn with ultrathin FeMn, accompanied by a significantly enhanced magnetic moment. The observed isotropic frequency enhancement is consistent with rotatable rather than unidirectional magnetic anisotropy and the induced magnetic moment links this anisotropy with the ferromagnet-proximity effect. The estimated effective anisotropy field acting on the proximity-induced moment in ultrathin FeMn can be as high as 0.5 T at room temperature. Our results show the potential of the ferromagnetic proximity effect combined with the inherent exchange anisotropy in antiferromagnets for high-speed spintronic applications.

Place, publisher, year, edition, pages
IOP Publishing, 2021
Keywords
exchange bias, magnetic multilayers, ferromagnetic resonance, magnetic proximity effect, exchange anisotropy, rotatable anisotropy
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-296363 (URN)10.1088/1361-6463/abfe39 (DOI)000655362000001 ()2-s2.0-85107006606 (Scopus ID)
Note

QC 20210617

Available from: 2021-06-17 Created: 2021-06-17 Last updated: 2022-06-25Bibliographically approved
Polishchuk, D., Nakonechna, O. I., Lytvynenko, Y. M. M., Kuncser, V., Savina, Y. O. O., Pashchenko, V. O., . . . Korenivski, V. (2021). Temperature and thickness dependent magnetostatic properties of [Fe/Py]/FeMn/Py multilayers. Low temperature physics (Woodbury, N.Y., Print), 47(6), 483-487
Open this publication in new window or tab >>Temperature and thickness dependent magnetostatic properties of [Fe/Py]/FeMn/Py multilayers
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2021 (English)In: Low temperature physics (Woodbury, N.Y., Print), ISSN 1063-777X, E-ISSN 1090-6517, Vol. 47, no 6, p. 483-487Article in journal (Refereed) Published
Abstract [en]

The magnetic properties of thin-film multilayers [Fe/Py]/FeMn/Py are investigated as a function of temperature and thickness of the antiferromagnetic FeMn spacer using SQUID magnetometry. The observed behavior differs substantially for the structures with 6 nm and 15 nm FeMn spacers. While the 15 nm FeMn structure exhibits exchange pinning of both ferromagnetic layers in the entire measurement temperature interval from 5 to 300 K, the 6 nm FeMn structure becomes exchange de-pinned in the vicinity of room temperature. The depinned state is characterized by a single hysteresis loop centered at zero field and having enhanced magnetic coercivity. The observed properties are explained in terms of finite-size effects and possible ferromagnetic interlayer coupling through the thin antiferromagnetic spacer.

Place, publisher, year, edition, pages
AIP Publishing, 2021
Keywords
antiferromagnet nanostructures, interlayer coupling, exchange bias, magnetic proximity effect, magnetic multilayer
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-299062 (URN)10.1063/10.0004971 (DOI)000668635100008 ()2-s2.0-85108912380 (Scopus ID)
Note

QC 20210729

Available from: 2021-07-29 Created: 2021-07-29 Last updated: 2022-06-25Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-2339-1692

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