磁粒子热疗：圆极化场下磁性纳米粒子的Neel弛豫
Magnetic particle hyperthermia: Neel relaxation in magnetic nanoparticles under circularly polarized field
摘要：
单畴铁磁颗粒的磁化反转机制在许多应用中是令人感兴趣的，在大多数应用中必须使损耗最小化。在通过热疗的癌症治疗中，相反的要求占主导地位：比损失功率应该最大化。在耗散机制中，我们研究了奈耳弛豫对不能移动或旋转的磁性纳米粒子的影响，并比较了线极化和圆极化场中的损耗。我们提出了精确的解析解的Landau-Lifshitz方程来自吉尔伯特方程，并使用计算出的随时间变化的磁化找到每个周期的能量损失。在低于拉莫尔频率的频率下，发现线偏振是更好的热功率源，在高频（超过拉莫尔频率）下，圆偏振是优选的。
英文摘要：
The mechanism of magnetization reversal in single-domain ferromagnetic particles is of interest in many applications, in most of which losses must be minimized. In cancer therapy by hyperthermia the opposite requirement prevails: the specific loss power should be maximized. Of the mechanisms of dissipation, here we study the effect of Neel relaxation on magnetic nanoparticles unable to move or rotate and compare the losses in linearly and circularly polarized field. We present exact analytical solutions of the Landau-Lifshitz equation as derived from the Gilbert equation and use the calculated time-dependent magnetizations to find the energy loss per cycle. In frequencies lower than the Larmor frequency linear polarization is found to be the better source of heat power, at high frequencies (beyond the Larmor frequency) circular polarization is preferable.
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