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Free- and reference-layer magnetization modes versus in-plane magnetic field in a magnetic tunnel junction with perpendicular magnetic easy axis
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. NanOsc AB, Sweden.ORCID iD: 0000-0003-3605-8872
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.ORCID iD: 0000-0001-9107-3309
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. University of Gothenburg, Sweden.
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2016 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 10, 104428Article in journal (Refereed) Published
Abstract [en]

We study the magnetodynamic modes of a magnetic tunnel junction with perpendicular magnetic easy axis (p-MTJ) in in-plane magnetic fields using device-level ferromagnetic resonance spectroscopy. We compare our experimental results to those of micromagnetic simulations of the entire p-MTJ. Using an iterative approach to determine the material parameters that best fit our experiment, we find excellent agreement between experiments and simulations in both the static magnetoresistance and magnetodynamics in the free and reference layers. From the micromagnetic simulations, we determine the spatial mode profiles, the localization of the modes and, as a consequence, their distribution in the frequency domain due to the inhomogeneous internal field distribution inside the p-MTJ under different applied field regimes. We also conclude that the excitation mechanism is a combination of the microwave voltage modulated perpendicular magnetic anisotropy, the microwave Oersted field, and the spin-transfer torque generated by the microwave current.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 94, no 10, 104428
National Category
Physical Sciences
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URN: urn:nbn:se:kth:diva-194266DOI: 10.1103/PhysRevB.94.104428ISI: 000384061100006Scopus ID: 2-s2.0-84990929511OAI: oai:DiVA.org:kth-194266DiVA: diva2:1039912
Note

QC 20161025

Available from: 2016-10-25 Created: 2016-10-21 Last updated: 2016-10-25Bibliographically approved

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Mazraati, HamidLe, Tuan Q.Chung, SunjaeÅkerman, Johan
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CiteExportLink to record
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