Microwave-assisted switching: optimal microwave field for a nanomagnet with surface anisotropy

8th International Conference on Fine Particle Magnetism

Barros, N.^1 ; Kachkachi, H.^1

PROMES-CNRS, Universit de Perpignan Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan Cedex, France^1

关键词: Effective field;    Frequency profiles;    Injected energy;    Microwave assisted;    Microwave field;    Optimal microwave;    Surface anisotropy;    Surface contribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/521/1/012005/pdf
DOI  :  10.1088/1742-6596/521/1/012005

来源: IOP

【 摘 要 】

We compute the optimal microwave field that induces the magnetization reversal of a nanomagnet modeled as a macrospin, while minimizing the total injected energy. Two complementary approaches, numerical and analytical, are presented. We then optimize the microwave field for a nanomagnet with a mixed uniaxial and cubic anisotropy. The optimal microwave fields are found to be modulated both in amplitude and frequency. We find that the cubic anisotropy, which is mainly due here to the surface contribution, has a major effect on the frequency profile, related to the variation of the effective field.