Tunable magnetic textures and excitation modes in FePt multilayer films.
Tunable magnetic textures and excitation modes in FePt multilayer films.
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FePt 多层薄膜中的可调磁性纹理和激发模式
作者：
利用微磁学模拟研究了FePt基多层膜的磁性织构和动态特性。通过改变磁参数，可以得到均匀态、Neel skyrmion和Bloch skyrmion。施加微波场以诱导自旋沿面外和面内轴沿着进动。对于垂直谐振模式，低频峰值被识别为畴壁模式。结果表明，随着频率的增加，出现了径向和方位向的共振模式。当微波场沿着面内轴方向施加时，激发模式有质的不同。对于均匀状态，相位响应于具有在圆中展开的波的激发，这是自旋波中的方位角模式的特征。由于Neel和Bloch skyrmions中的非均匀有效场，动态响应集中在中心，边缘扩展到相邻区域。这些观测结果对于基于Skyrmion的器件中可调谐和丰富的高频磁性非常重要。
Micromagnetic simulations have been performed to investigate the magnetic textures and dynamic properties of FePt-based multilayer films. The uniform state, Neel skyrmion and Bloch skyrmion can be obtained using variable magnetic parameters. A microwave field is applied to induce spin precession along the out-plane and in-plane axes. For the perpendicular resonance modes, low-frequency peaks are identified as domain-wall modes. It is shown that radial-like and azimuthal-like resonance modes appear with increase in frequency. The excited modes are qualitatively different when the microwave field is applied along the in-plane axis. For the uniform state, the phase responds to the excitation with waves that spread out in a circle, which is a characteristic feature of the azimuthal mode in the spin wave. Because of the nonuniform effective field in Neel and Bloch skyrmions, the dynamic response localizes at the center and the edge spreads into the adjacent domains. These observations are important for tunable and abundant high-frequency magnetic properties in skyrmion-based devices.
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