论文标题
反铁磁铁中的非经典自旋转移效应
Non-classical spin transfer effects in an antiferromagnet
论文作者
论文摘要
我们通过一系列抗磁性耦合的量子旋转来模拟电子的散射，以分析经典磁性模型未描述的自旋转移效应。我们的模拟显示了对动态状态的有效激发，这些态将被半经典的对称性所禁止，例如单个电子产生多个磁激发量子。此外，自旋波函数的量子干扰能够生成磁化动力学，并具有超过传递的磁矩的幅度。激发的效率几乎与电子自旋极化无关，并且主要由能量转移控制。因此，非古典自旋转移可以实现不受经典约束限制的抗铁磁体的有效电子控制。
We simulate scattering of electrons by a chain of antiferromagnetically coupled quantum Heisenberg spins, to analyze spin-transfer effects not described by the classical models of magnetism. Our simulations demonstrate efficient excitation of dynamical states that would be forbidden by the semiclassical symmetries, such as generation of multiple magnetic excitation quanta by a single electron. Furthermore, quantum interference of spin wavefunctions enables generation of magnetization dynamics with amplitudes exceeding the transferred magnetic moment. The efficiency of excitation is almost independent of the electron spin polarization, and is governed mainly by the transfer of energy. Non-classical spin transfer may thus enable efficient electronic control of antiferromagnets not limited by the classical constraints.
