Unidirectional emission and reconfigurability of channeled spin waves from a vortex core in a teardrop-shaped nanopatch,Physical Review B

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Unidirectional emission and reconfigurability of channeled spin waves from a vortex core in a teardrop-shaped nanopatch
Physical Review B ( IF 3.2 ) Pub Date : 2021-09-21 , DOI: 10.1103/physrevb.104.094427
D. Osuna Ruiz _{1,

2} , E. L. Martin ₂ , A. P. Hibbins ₂ , F. Y. Ogrin ₂

Affiliation

We propose the design of a teardrop-shaped magnetic patch as a unidirectional magnetically driven spin wave emitter capable of operating in a wide range of frequencies. We explore its potential through micromagnetic studies in line with vibrational sample magnetometry measurements and ferromagnetic resonance experiments. The proposed system is based on the excitation of a vortex core, acting as a source of spin waves, and a single Bloch domain wall, as a channel for the confinement and propagation of the mode in a sufficiently thick magnetic patch in the single magnetic vortex (SMV) state. The novelty consists in the reconfigurability and simplicity of the system, that is operational without the need of external saturating fields, retaining a single Bloch domain wall and a movable single vortex core. This allows significant suppression of the wave emission by means of an external bias field, which in turn allows a controllable valvelike effect. Following our proposed strategy for cultivating a single vortex core in the shape, and after a thorough micromagnetic study of the most prominent magnetization dynamics in the patch, we show that the SMV state can be obtained in a thick enough (80 nm) teardrop-shaped patch. Micromagnetic results show the potential of this simple structure as a tunable and unidirectional spin wave emitter. Experimental results also suggest that the required magnetic configuration has been experimentally obtained in the structure, in good agreement with micromagnetic simulations.

中文翻译：

泪珠状纳米片中涡核的通道自旋波的单向发射和可重构性

我们建议将泪珠形磁贴设计为能够在很宽的频率范围内工作的单向磁驱动自旋波发射器。我们通过与振动样品磁力测量和铁磁共振实验相一致的微磁研究探索其潜力。所提出的系统基于作为自旋波源的涡核的激发和作为在单个磁涡中足够厚的磁片中限制和传播模式的通道的单个布洛赫畴壁(SMV) 状态。新颖之处在于系统的可重构性和简单性，即无需外部饱和场即可运行，保留单个布洛赫畴壁和一个可移动的单涡核。这允许通过外部偏置场显着抑制波发射，这又允许可控的阀状效应。遵循我们提出的在形状中培养单个涡核的策略，并在对贴片中最突出的磁化动力学进行彻底的微磁研究后，我们表明可以在足够厚（80 nm）的泪珠形中获得 SMV 状态修补。微磁结果显示了这种简单结构作为可调谐单向自旋波发射器的潜力。实验结果还表明，所需的磁性配置已在结构中通过实验获得，与微磁模拟非常吻合。

更新日期：2021-09-21

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