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arXiv · 1508.07290

Control of magnetic relaxation by electric-field-induced ferroelectric phase transition and inhomogeneous domain switching

Tianxiang Nan·Satoru Emori·Bin Peng·Xinjun Wang·Zhongqiang Hu·Li Xie·Yuan Gao·Hwaider Lin·Di Lin·Haosu Luo·David Budil·John G. Jones·Brandon M. Howe·Gail J. Brown·Ming Liu·Nian Sun
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Abstract

Electric-field modulation of magnetism in strain-mediated multiferroic heterostructures is considered a promising scheme for enabling memory and magnetic microwave devices with ultralow power consumption. However, it is not well understood how electric-field-induced strain influences magnetic relaxation, an important physical process for device applications. Here we investigate resonant magnetization dynamics in ferromagnet/ferrolectric multiferroic heterostructures, FeGaB/PMN-PT and NiFe/PMN-PT, in two distinct strain states provided by electric-field-induced ferroelectric phase transition. The strain not only modifies magnetic anisotropy but also magnetic relaxation. In FeGaB/PMN-PT, we observe a nearly two-fold change in intrinsic Gilbert damping by electric field, which is attributed to strain-induced tuning of spin-orbit coupling. By contrast, a small but measurable change in extrinsic linewidth broadening is attributed to inhomogeneous ferroelastic domain switching during the phase transition of the PMN-PT substrate.

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Tianxiang Nan, Satoru Emori, Bin Peng, Xinjun Wang, Zhongqiang Hu, Li Xie, Yuan Gao, Hwaider Lin, Di Lin, Haosu Luo, David Budil, John G. Jones, Brandon M. Howe, Gail J. Brown, Ming Liu, Nian Sun. 2015-09-08. Control of magnetic relaxation by electric-field-induced ferroelectric phase transition and inhomogeneous domain switching. https://doi.org/10.1063/1.4939441

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