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Laser-induced ultrafast spin reorientation in the antiferromagnet TmFeO3

机译:反铁磁体TmFeO3中的激光诱导超快速自旋取向

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摘要

All magnetically ordered materials can be divided into two primary classes: ferromagnets(1,2) and antiferromagnets(3). Since ancient times, ferromagnetic materials have found vast application areas(4), from the compass to computer storage and more recently to magnetic random access memory and spintronics(5). In contrast, antiferromagnetic (AFM) materials, though representing the overwhelming majority of magnetically ordered materials, for a long time were of academic interest only. The fundamental difference between the two types of magnetic materials manifests itself in their reaction to an external magnetic field-in an antiferromagnet, the exchange interaction leads to zero net magnetization. The related absence of a net angular momentum should result in orders of magnitude faster AFM spin dynamics(6,7). Here we show that, using a short laser pulse, the spins of the antiferromagnet TmFeO3 can indeed be manipulated on a timescale of a few picoseconds, in contrast to the hundreds of picoseconds in a ferromagnet(8-12). Because the ultrafast dynamics of spins in antiferromagnets is a key issue for exchange-biased devices(13), this finding can expand the now limited set of applications for AFM materials.
机译:所有磁性排序的材料都可以分为两大类:铁磁体(1,2)和反铁磁体(3)。自古以来,铁磁材料已发现了广阔的应用领域(4),从指南针到计算机存储,最近又发展到磁性随机存取存储器和自旋电子学(5)。相比之下,反铁磁(AFM)材料尽管代表了绝大多数有序磁性材料,但长期以来仅在学术上引起关注。两种磁性材料之间的根本区别体现在它们对外部磁场的反应中-在反铁磁体中,交换相互作用导致净磁化为零。相关的净角动量的缺乏应导致AFM自旋动力学更快的数量级(6,7)。在这里我们表明,使用短激光脉冲,反铁磁体TmFeO3的自旋实际上可以在几皮秒的时间尺度上进行控制,而铁磁体中的皮秒数为数百皮秒(8-12)。因为反铁磁体中自旋的超快动力学是交换偏置设备的关键问题(13),所以这一发现可以扩展目前有限的AFM材料应用范围。

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