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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, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Materialfysik, MF. NanOsc AB, Sweden.ORCID-id: 0000-0003-3605-8872
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Materialfysik, MF.ORCID-id: 0000-0001-9107-3309
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Materialfysik, MF. University of Gothenburg, Sweden.
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2016 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, nr 10, artikkel-id 104428Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
American Physical Society , 2016. Vol. 94, nr 10, artikkel-id 104428
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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, id: diva2:1039912
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QC 20161025

Tilgjengelig fra: 2016-10-25 Laget: 2016-10-21 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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