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arXiv 1503.05604cond-mat.mtrl-sci
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室温反铁磁记忆电阻

Room-temperature antiferromagnetic memory resistor

X. Marti, I. Fina, C. Frontera, Jian Liu, P. Wadley, Q. He, R. J. Paull, J. D. Clarkson, J. Kudrnovský, I. Turek, J. Kuneš, D. Yi, J. -H. Chu, C. T. Nelson, L. … 展开作者

X. Marti, I. Fina, C. Frontera, Jian Liu, P. Wadley, Q. He, R. J. Paull, J. D. Clarkson, J. Kudrnovský, I. Turek, J. Kuneš, D. Yi, J. -H. Chu, C. T. Nelson, L. You, E. Arenholz, S. Salahuddin, J. Fontcuberta, T. Jungwirth, R. Ramesh

摘要:

铁磁体中有序自旋态的双稳性提供了磁存储功能。传统上,利用FM中有序自旋的宏观磁矩通过弱的外部磁场在磁介质上写入信息,并且FM杂散场用于读取。然而,最新一代的磁性随机存取存储器展示了一种新的有效方法,其中磁场被用于读取和写入的电装置所取代。这个概念可能最终使FM对磁场的敏感性成为保持的一个弱点,而FM杂散场则成为高密度存储器集成的一个障碍。在本文中,我们报告了一个室温的反铁磁(AFM)存储器,它产生的杂散场可以忽略不计,是惰性的强磁场。我们使用的电阻器制成的FeRh原子力显微镜的过渡到FM阶100度以上的室温,使我们能够磁性地设置不同的集体方向的Fe时刻。在冷却到室温时,AFM顺序设置在由高温FM状态下的场和力矩方向预先确定的AFM力矩的方向上。对于电读取,我们使用各向异性磁阻(AMR)的反铁磁模拟。我们报告微观理论建模证实,这种原型自旋电子效应发现超过150年前在FM,可以同样存在于AFM。我们的工作表明,实现室温自旋电子存储器与原子力显微镜,大大扩展了这些设备的磁性材料的基础,并提供在FM无与伦比的性能的可行性。

英文摘要:

The bistability of ordered spin states in ferromagnets (FMs) provides the magnetic memory functionality. Traditionally, the macroscopic moment of ordered spins in FMs is utilized to write information on magnetic media by a weak external magnetic field, and the FM stray field is used for reading. However, the latest generation of magnetic random access memories demonstrates a new efficient approach in which magnetic fields are replaced by electrical means for reading and writing. This concept may eventually leave the sensitivity of FMs to magnetic fields as a mere weakness for retention and the FM stray fields as a mere obstacle for high-density memory integration. In this paper we report a room-temperature bistable antiferromagnetic (AFM) memory which produces negligible stray fields and is inert in strong magnetic fields. We use a resistor made of an FeRh AFM whose transition to a FM order 100 degrees above room-temperature, allows us to magnetically set different collective directions of Fe moments. Upon cooling to room-temperature, the AFM order sets in with the direction the AFM moments pre-determined by the field and moment direction in the high temperature FM state. For electrical reading, we use an antiferromagnetic analogue of the anisotropic magnetoresistance (AMR). We report microscopic theory modeling which confirms that this archetypical spintronic effect discovered more than 150 years ago in FMs, can be equally present in AFMs. Our work demonstrates the feasibility to realize room-temperature spintronic memories with AFMs which greatly expands the magnetic materials base for these devices and offers properties which are unparalleled in FMs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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