is a prototypical antiferromagnet with a characteristic resonance frequency in the THz range. From atomistic spin dynamics simulations that take into account the crystallographic structure of NiO, and in particular a magnetic anisotropy respecting its symmetry, we describe antiferromagnetic switching at THz frequency by a spin transfer torque mechanism. Sub-picosecond S-state switching between the six allowed stable spin directions is found for reasonably achievable spin currents, like those generated by laser induced ultrafast demagnetization. A simple procedure for picosecond writing of a six-state memory is described, thus opening the possibility to speed up current logic of electronic devices by several orders of magnitude.

中文翻译：

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自旋传递转矩在NiO中超快速反铁磁畴转换

是典型的反铁磁体，其特征共振频率在THz范围内。从考虑了NiO的晶体结构的原子自旋动力学模拟，特别是考虑到其对称性的磁各向异性，我们通过自旋传递转矩机制描述了在THz频率下的反铁磁开关。对于合理可实现的自旋电流，发现了在六个允许的稳定自旋方向之间的亚皮秒S状态切换，就像激光诱导的超快退磁所产生的电流一样。描述了用于皮秒写入六态存储器的简单过程，从而为将电子设备的当前逻辑加速几个数量级提供了可能性。