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Grishin, A. M. & Khartsev, S. (2019). Waveguiding in All-Garnet Heteroepitaxial Magneto-Optical Photonic Crystals. JETP Letters: Journal of Experimental And Theoretical Physics Letters, 109(2), 83-86
Open this publication in new window or tab >>Waveguiding in All-Garnet Heteroepitaxial Magneto-Optical Photonic Crystals
2019 (English)In: JETP Letters: Journal of Experimental And Theoretical Physics Letters, ISSN 0021-3640, E-ISSN 1090-6487, Vol. 109, no 2, p. 83-86Article in journal (Refereed) Published
Abstract [en]

We report the properties of 1D all-garnet heteroepitaxial 21 layered magneto-optical photonic crystal designed and fabricated for the resonance wavelength 750 +/- 3 nm. It is composed of alternating magnetooptical-active Bi3Fe5O12 and transparent Sm3Ga5O12 quarter-wavelength layers radio frequency magnetron sputtered onto single crystalline Ca, Mg, Zr:Gd3Ga5O12(111) substrate. Edges of the band gap and resonant central peaks in transmission and Faraday rotation spectra experience significant (about 60 nm) "blueshift" when the angle of light incidence increases up to 70 degrees. Lower reflectance and strong enhancement of Faraday rotation of TE mode compared to the TM-polarized light testify a waveguiding of TE-mode within a resonant lambda/2 Bi3Fe5O12 cavity.

Place, publisher, year, edition, pages
MAIK NAUKA/INTERPERIODICA/SPRINGER, 2019
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-252414 (URN)10.1134/S0021364019020012 (DOI)000467096800002 ()2-s2.0-85060185850 (Scopus ID)
Note

QC 20190614

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-06-14Bibliographically approved
Haidar, M., Durrenfeld, P., Ranjbar, M., Balinsky, M., Fazlali, M., Dvornik, M., . . . Åkerman, J. (2016). Controlling Gilbert damping in a YIG film using nonlocal spin currents. Physical Review B, 94(18), Article ID 180409.
Open this publication in new window or tab >>Controlling Gilbert damping in a YIG film using nonlocal spin currents
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2016 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 18, article id 180409Article in journal (Refereed) Published
Abstract [en]

We demonstrate the control of Gilbert damping in 65-nm-thick yttrium iron garnet (YIG) films using a spin-polarized current generated by a direct current through a nanocontact, spin filtered by a thin Co layer. The magnetodynamics of both the YIG and the Co layers can be excited by a pulse-modulated microwave current injected through the nanocontact and the response detected as a lock-in amplified voltage over the device. The spectra show three clear peaks, two associated with the ferromagnetic resonance (FMR) in each layer, and an additional Co mode with a higher wave vector proportional to the inverse of the nanocontact diameter. By varying the sign and magnitude of the direct nanocontact current, we can either increase or decrease the linewidth of the YIG FMR peak consistent with additional positive or negative damping being exerted by the nonlocal spin current injected into the YIG film. Our nanocontact approach thus offers an alternative route in the search for auto-oscillations in YIG films.

Place, publisher, year, edition, pages
American Physical Society, 2016
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-199537 (URN)10.1103/PhysRevB.94.180409 (DOI)000388816200002 ()2-s2.0-84998717732 (Scopus ID)
Note

QC 20170116

Available from: 2017-01-16 Created: 2017-01-09 Last updated: 2017-11-29Bibliographically approved
Balinsky, M., Ranjbar, M., Haidar, M., Durrenfeld, P., Khartsev, S., Slavin, A., . . . Dumas, R. K. (2015). Spin Pumping and the Inverse Spin-Hall Effect via Magnetostatic Surface Spin-Wave Modes in Yttrium-Iron Garnet/Platinum Bilayers. IEEE Magnetics Letters, 6(3000604)
Open this publication in new window or tab >>Spin Pumping and the Inverse Spin-Hall Effect via Magnetostatic Surface Spin-Wave Modes in Yttrium-Iron Garnet/Platinum Bilayers
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2015 (English)In: IEEE Magnetics Letters, ISSN 1949-307X, E-ISSN 1949-3088, Vol. 6, no 3000604Article in journal (Refereed) Published
Abstract [en]

Spin pumping at a boundary between a yttrium-iron garnet (YIG) film and a thin platinum (Pt) layer is studied under conditions in which a magnetostatic surface spin wave (MSSW, or Damon-Eshbach mode) is excited in YIG by a narrow strip-line antenna. It is shown that the voltage created by the inverse spin-Hall effect (ISHE) in Pt is strongly dependent on the wavevector of the excited MSSW. For YIG film thicknesses of 41 and 0.9 mu m, the maximum ISHE voltage corresponds to the maximum of efficiently excited MSSW wavevectors and does not coincide with the maximum of absorbed microwave power. For a thinner (0.175 mu m) YIG film, the maximum of the ISHE voltage moves closer to the ferromagnetic resonance and almost coincides with the region of the maximum microwave absorption. We show that the effect is related to the change in the thickness profile and the wavenumber spectrum of the excited MSSW taking place when the YIG film thickness is increased.

Keywords
Spin electronics, inverse spin-Hall effect, spin pumping, magnetostatic surface spin waves
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-175518 (URN)10.1109/LMAG.2015.2471276 (DOI)000361770700001 ()
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
Note

QC 20151021

Available from: 2015-10-21 Created: 2015-10-16 Last updated: 2017-12-01Bibliographically approved
Haidar, M., Ranjbar, M., Balinsky, M., Dumas, R. K., Khartsev, S. & Åkerman, J. (2015). Thickness- and temperature-dependent magnetodynamic properties of yttrium iron garnet thin films. Journal of Applied Physics, 117(17), Article ID 17D119.
Open this publication in new window or tab >>Thickness- and temperature-dependent magnetodynamic properties of yttrium iron garnet thin films
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2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 117, no 17, article id 17D119Article in journal (Refereed) Published
Abstract [en]

The magnetodynamical properties of nanometer-thick yttrium iron garnet films are studied using ferromagnetic resonance as a function of temperature. The films were grown on gadolinium gallium garnet substrates by pulsed laser deposition. First, we found that the damping coefficient increases as the temperature increases for different film thicknesses. Second, we found two different dependencies of the damping on film thickness: at room temperature, the damping coefficient increases as the film thickness decreases, while at T = 8 K, we find the damping to depend only weakly on the thickness. We attribute this behavior to an enhancement of the relaxation of the magnetization by impurities or defects at the surfaces.

Keywords
Damping, Film thickness, Gallium alloys, Pulsed laser deposition, Yttrium, Yttrium alloys, Yttrium compounds, Damping coefficients, Gadolinium gallium garnets, Magnetodynamics, Room temperature, Temperature dependent, Temperature increase, Yttrium iron garnet films, Yttrium iron garnets
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-166934 (URN)10.1063/1.4914363 (DOI)000354984100342 ()2-s2.0-84924859646 (Scopus ID)
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilKnut and Alice Wallenberg FoundationEU, European Research Council, 307144 "MUSTANG"
Note

QC 20150609

Available from: 2015-06-09 Created: 2015-05-21 Last updated: 2017-12-04Bibliographically approved
Grishin, A. M., Khartsev, S. I., Bohlmark, J. & Ahlgren, M. (2015). Ultra-hard AlMgB14 Coatings Fabricated by RF Magnetron Sputtering from a Stoichiometric Target. JETP Letters: Journal of Experimental And Theoretical Physics Letters, 100(10), 680-687
Open this publication in new window or tab >>Ultra-hard AlMgB14 Coatings Fabricated by RF Magnetron Sputtering from a Stoichiometric Target
2015 (English)In: JETP Letters: Journal of Experimental And Theoretical Physics Letters, ISSN 0021-3640, E-ISSN 1090-6487, Vol. 100, no 10, p. 680-687Article in journal (Refereed) Published
Abstract [en]

For the first time hard aluminum magnesium boride films were fabricated by RF magnetron sputtering from a single stoichiometric ceramic AlMgB14 target. Optimized processing conditions (substrate temperature, target sputtering power and target-to-substrate distance) enable fabrication of stoichiometric in-depth compositionally homogeneous films with the peak values of nanohardness 88 GPa and Young's modulus 517 GPa at the penetration depth of 26 nm and, respectively, 35 and 275 GPa at 200 nm depth in 2 mu m thick film.

National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-162974 (URN)10.1134/S0021364014220056 (DOI)000350022900016 ()2-s2.0-84923079794 (Scopus ID)
Note

QC 20150331

Available from: 2015-03-31 Created: 2015-03-26 Last updated: 2017-12-04Bibliographically approved
Belotelov, V. I., Kreilkamp, L. E., Kalish, A. N., Akimov, I. A., Bykov, D. A., Kasture, S., . . . Bayer, M. (2014). Magnetophotonic intensity effects in hybrid metal-dielectric structures. Physical Review B. Condensed Matter and Materials Physics, 89(4), 045118
Open this publication in new window or tab >>Magnetophotonic intensity effects in hybrid metal-dielectric structures
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2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 4, p. 045118-Article in journal (Refereed) Published
Abstract [en]

The magneto-optical properties of a hybrid metal-dielectric structure consisting of a one-dimensional gold grating on top of a magnetic waveguide layer are studied experimentally and theoretically. It is demonstrated that a magnetic field applied in the longitudinal configuration (in the plane of the magnetic film and perpendicular to the slits in the gold grating) to the metal-dielectric structure modifies the field distribution of the optical modes and thus changes the mode excitation conditions. In the optical far field, this manifests in the alteration of the optical transmittance or reflectance when the structure becomes magnetized. This magneto-optical effect is shown to represent a novel class of effects related to the magnetic-field-induced modification of the Bloch modes of the periodic hybrid structure. That is why we define this effect as "longitudinal magnetophotonic intensity effect" (LMPIE). The LMPIE has two contributions, odd and even in magnetization. While the even LMPIE is maximal for the light polarized perpendicular to the grating slits (TM) and minimal for the orthogonal polarization (TE), the odd LMPIE takes maximum values at some intermediate polarization and vanishes for pure TM and TE polarizations. Two principal modes of the magnetic layer - TM and TE - acquire in the longitudinal magnetic field additional field components and thus turn into quasi-TM and quasi-TE modes, respectively. The largest LMPIE is observed for excitation of the antisymmetrical quasi-TE mode by TM-polarized light. The value of the LMPIE measured for the plasmonic structure with a magnetic film of Bi2Dy1Fe4Ga1O12 composition is about 1% for the even effect and 2% for the odd one. However, the plasmonic structure with a magnetic film with a higher concentration of bismuth (Bi2.97Er0.03Fe4Al0.5Ga0.5O12) gives significantly larger LMPIE: even LMPIE reaches 24% and odd LMPIE is 9%. Enhancement of the magneto-optical figure of merit (defined as the ratio of the specific Faraday angle of a magnetic film to its absorption coefficient) of the magnetic films potentially causes the even LMPIE to exceed 100% as is predicted by calculations. Thus, the nanostructured material described here may be considered as an ultrafast magnetophotonic light valve.

Keywords
Surface-Plasmon Polaritons, Thin Ferromagnetic-Films, Magnetic-Field, Magnetooptical Activity, Gratings, Transmission, Crystals, Nickel, Metamaterials, Permittivity
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-143050 (URN)10.1103/PhysRevB.89.045118 (DOI)000332213300001 ()2-s2.0-84893087321 (Scopus ID)
Note

QC 20140317

Available from: 2014-03-17 Created: 2014-03-17 Last updated: 2017-12-05Bibliographically approved
Velichko, A., Boriskov, P., Savenko, A., Grishin, A., Khartsev, S., Yar, M. . & Muhammed, M. (2014). Memory resistive switching in CeO2-based film microstructures patterned by a focused ion beam. Thin Solid Films, 556, 520-524
Open this publication in new window or tab >>Memory resistive switching in CeO2-based film microstructures patterned by a focused ion beam
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2014 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 556, p. 520-524Article in journal (Refereed) Published
Abstract [en]

Heteroepitaxial CeO2 (80 nm)/La0.5Sr0.5CoO3 (500 nm) film structure has been pulsed laser deposited on a sapphire substrate. The Ag/CeO2 microjunctions patterned by a focused ion beam on a La0.5Sr0.5CoO3 film exhibit reproducible reversible switching between a high resistance state (OFF) with insulating properties and a semiconducting or metallic low resistance state (ON) with resistance ratios up to 10(4). The influence of micro-scaling and defects formed at the cell boundaries during etching on its electrical characteristics has been analyzed. The appearance of a switching channel at the moment of the electrical forming, responsible for the memory effect, has been proved, along with a mechanism of a self-healing electrical breakdown.

Keywords
Oxide heterostructure, Memory resistive switching, Focused ion beam
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-144534 (URN)10.1016/j.tsf.2014.01.053 (DOI)000333085700083 ()2-s2.0-84896404802 (Scopus ID)
Note

QC 20140428

Available from: 2014-04-28 Created: 2014-04-24 Last updated: 2017-12-05Bibliographically approved
Linnarsson, M. K., Khartsev, S., Primetzhofer, D., Possnert, G. & Hallén, A. (2014). ToF-MEIS stopping measurements in thin SiC films. Paper presented at 21st International Conference on Ion Beam Analysis (IBA), JUN 23-28, 2013, Seattle, WA, United States. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 332, 130-133
Open this publication in new window or tab >>ToF-MEIS stopping measurements in thin SiC films
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2014 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 332, p. 130-133Article in journal (Refereed) Published
Abstract [en]

Electronic stopping in thin, amorphous, SiC films has been studied by time-of-flight medium energy ion scattering and conventional Rutherford backscattering spectrometry. Amorphous SiC films (8, 21 and 36 nm) were prepared by laser ablation using a single crystalline silicon carbide target. Two kinds of substrate films, one with a lower atomic mass (carbon) and one with higher atomic mass (iridium) compared to silicon has been used. Monte Carlo simulations have been used to evaluate electronic stopping from the shift in energy for the signal scattered from Ir with and without SiC. The two kinds of samples are used to illustrate the strength and challenges for ToF-MEIS compared to conventional RBS.

Keywords
SiC, MEIS, RBS, Electronic stopping cross section
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-149191 (URN)10.1016/j.nimb.2014.02.045 (DOI)000339131200029 ()2-s2.0-84902536631 (Scopus ID)
Conference
21st International Conference on Ion Beam Analysis (IBA), JUN 23-28, 2013, Seattle, WA, United States
Note

QC 20140818

Available from: 2014-08-18 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved
Belotelov, V. I., Kreilkamp, L. E., Akimov, I. A., Kalish, A. N., Bykov, D. A., Kasture, S., . . . Bayer, M. (2013). Plasmon-mediated magneto-optical transparency. Nature Communications, 4, 2128
Open this publication in new window or tab >>Plasmon-mediated magneto-optical transparency
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2013 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 4, p. 2128-Article in journal (Refereed) Published
Abstract [en]

Magnetic field control of light is among the most intriguing methods for modulation of light intensity and polarization on sub-nanosecond timescales. The implementation in nanostructured hybrid materials provides a remarkable increase of magneto-optical effects. However, so far only the enhancement of already known effects has been demonstrated in such materials. Here we postulate a novel magneto-optical phenomenon that originates solely from suitably designed nanostructured metal-dielectric material, the so-called magneto-plasmonic crystal. In this material, an incident light excites coupled plasmonic oscillations and a waveguide mode. An in-plane magnetic field allows excitation of an orthogonally polarized waveguide mode that modifies optical spectrum of the magneto-plasmonic crystal and increases its transparency. The experimentally achieved light intensity modulation reaches 24%. As the effect can potentially exceed 100%, it may have great importance for applied nanophotonics. Further, the effect allows manipulating and exciting waveguide modes by a magnetic field and light of proper polarization.

Keywords
Magnetic-Field, Ferromagnetic-Films, Transmission, Enhancement, Resonance, Permittivity, Crystals, Gratings
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-129132 (URN)10.1038/ncomms3128 (DOI)000323715900008 ()2-s2.0-84880319627 (Scopus ID)
Note

QC 20130930

Available from: 2013-09-30 Created: 2013-09-19 Last updated: 2017-12-06Bibliographically approved
Grishin, A. M. & Khartsev, S. I. (2012). Green and blue magneto-optical photonic crystals. Thin Solid Films, 520(9), 3647-3650
Open this publication in new window or tab >>Green and blue magneto-optical photonic crystals
2012 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 520, no 9, p. 3647-3650Article in journal (Refereed) Published
Abstract [en]

A series of one-dimensional heteroepitaxial all-garnet magneto-optical photonic crystals (MOPCs) were pulsed laser deposited to operate at 550 and 470 nm wavelength. We explored the concept of blue shift of the optical absorption edge of ferric ions by substituting Fe with Ga on the tetrahedral sites as well as Bi and Y, respectively, with Ca and Ce at the dodecahedral coordinated positions. 17-layered [Y2Ce1Fe5O12/Gd3Ga5O12] MOPC with a total thickness of 968 nm demonstrates superior magneto-optical performance: Faraday rotation theta(Fmax) = + 2.0 degrees and transmittance as high as 0.35 at the resonance wavelength of 470 nm.

Keywords
Bismuth/rare-earth iron garnet, All-garnet heteroepitaxial film, Faraday rotation
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-93396 (URN)10.1016/j.tsf.2011.12.062 (DOI)000301627100039 ()2-s2.0-84857368053 (Scopus ID)
Funder
Swedish Research Council
Note
QC 20120416Available from: 2012-04-16 Created: 2012-04-16 Last updated: 2017-12-07Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8774-9302

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