Probing VCMA in MTJs with in-plane magnetization

Voltage controlled magnetic anisotropy (VCMA) is a novel method to switch magnetizations in low-power and ultra-fast applications based on magnetic tunnel junctions (MTJs). Here we explore the ferromagnetic resonance (FMR) technique to probe VCMA in situations where other methods cannot be applied....

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Bibliographic Details
Published inAIP advances Vol. 7; no. 11; pp. 115023 - 115023-4
Main Authors Williamson, M., de Rozieres, M., Almasi, H., Chao, X., Wang, W., Wang, J.-P., Tsoi, M.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.11.2017
AIP Publishing LLC
Subjects
Electric potential
Ferromagnetic resonance
Ferromagnetism
Magnetic anisotropy
Tunnel junctions
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Summary:Voltage controlled magnetic anisotropy (VCMA) is a novel method to switch magnetizations in low-power and ultra-fast applications based on magnetic tunnel junctions (MTJs). Here we explore the ferromagnetic resonance (FMR) technique to probe VCMA in situations where other methods cannot be applied. We quantify VCMA in CoFeB/MgO/CoFeB MTJ nanopillars with in-plane magnetizations where our FMR method is unique in providing direct information about VCMA. We observe a quadratic shift of the FMR resonance field when a voltage bias is applied across the MTJ. The VCMA energy corresponding to the quadratic shift varies with an energy factor of 8.2μJ/m2 for 1 V2/nm2. These results are important for understanding magnetodynamics in MTJ-based applications with in-plane magnetizations.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5008379