Probing VCMA in MTJs with in-plane magnetization | Zendy

Morgan Williamson | Zendy; M. de Rozieres | Zendy; H. Almasi | Zendy; Xiaohui Chao | Zendy; W. Wang | Zendy; J.-P. Wang | Zendy; Maxim Tsoi | Zendy

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Probing VCMA in MTJs with in-plane magnetization

Author(s) -

Morgan Williamson,

M. de Rozieres,

H. Almasi,

Xiaohui Chao,

W. Wang,

J.-P. Wang,

Maxim Tsoi

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5008379

Subject(s) - condensed matter physics , nanopillar , ferromagnetic resonance , magnetic anisotropy , magnetization , tunnel magnetoresistance , ferromagnetism , anisotropy energy , spin (aerodynamics) , nuclear magnetic resonance , materials science , physics , nanotechnology , magnetic field , nanostructure , quantum mechanics , thermodynamics

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

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