Probing VCMA in MTJs with in-plane magnetization

M. Williamson, M. De Rozieres, H. Almasi, X. Chao, Weigang Wang, J. P. Wang, M. Tsoi

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Article number115023
JournalAIP Advances
Volume7
Issue number11
DOIs
StatePublished - Nov 1 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Williamson, M., De Rozieres, M., Almasi, H., Chao, X., Wang, W., Wang, J. P., & Tsoi, M. (2017). Probing VCMA in MTJs with in-plane magnetization. AIP Advances, 7(11), [115023]. https://doi.org/10.1063/1.5008379