磁性纳米粒子内自旋波的磁化反转
Magnetization reversal via internal spin waves in magnetic nanoparticles
摘要：
通过数值求解原子自旋的运动方程，我们表明，在足够大的磁性粒子的内部自旋波过程，最初在不稳定的状态，导致完全磁化反转和热化。粒子的磁化强度在反转过程中强烈下降，然后恢复。我们确定了两个主要的情况下，指数和线性自旋波不稳定性。对于后者，纵向和横向弛豫率已获得解析。这些速率的取向依赖性导致粒子的磁化强度在长时间内的非指数弛豫。
英文摘要：
By numerically solving the equations of motion for atomic spins we show that internal spin-wave processes in large enough magnetic particles, initially in unstable states, lead to complete magnetization reversal and thermalization. The particle's magnetization strongly decreases in the middle of reversal and then recovers. We identify two main scenarios, exponential and linear spin-wave instabilities. For the latter, the longitudinal and transverse relaxation rates have been obtained analytically. Orientation dependence of these rates leads to a nonexponential relaxation of the particle's magnetization at long times.
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