自旋热力学控制的磁性铁蛋白超晶的非线性高频磁响应
Nonlinear high-frequency magnetic response of magnetoferritin metacrystals governed by spin thermodynamics
摘要：
本文提出了由磁性铁蛋白大分子组成的变晶的磁化强度随时间变化的理论。这样的超结构，包括数百万个封装在蛋白质壳中的超顺磁性纳米颗粒，可以使用生物化学组装技术人工创建。它们也被证明天然存在于鸟类内耳的敏感细胞中，这表明它们可能参与检测地磁场，以确定迁徙动物的方向和导航。磁性铁蛋白超晶的磁性系统的动力学，包括由长程偶极力耦合的非常大量的磁矩，是非常复杂的。为了找到超晶对高频磁场的响应，我们使用了从固体核自旋系统理论中借用的热力学方法。由此产生的理论产生的时间依赖的超自旋温度和磁化强度的任意强度的振荡磁场诱导。预测的高频响应对静态磁场的依赖性可用于生物组织中的磁性铁蛋白超晶体的实验检测和表征。
英文摘要：
A theory is developed of the time-dependent magnetization of the metacrystal composed of magnetoferritin macromolecules. Such superstructures, comprising up to several millions of superparamagnetic nanoparticles encapsulated in protein shells, can be created artificially using biochemical assembling technologies. They have been also shown to occur naturally in sensitive cells of the inner ear of birds, which suggests their possible involvement in the detection of the geomagnetic field for orientation and navigation of migratory animals. The dynamics of the magnetic system of the magnetoferritin metacrystal, comprising a very large number of magnetic moments coupled by long-range dipole forces, is exceedingly complex. In order to find the response of the metacrystal to high-frequency magnetic fields, we used a thermodynamic approach borrowed from the theory of nuclear spin systems of solids. The resulted theory yields the time-dependent superspin temperature and magnetization induced by oscillating magnetic fields of arbitrary strength. The predicted dependence of the high-frequency response on the static magnetic field can be used for experimental detection and characterization of magnetoferritin metacrystals in biological tissues.
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