非共线分子极化的涌现多铁交替磁体与自旋控制

IF 7.5 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Ziye Zhu, Yuntian Liu, Xunkai Duan, Jiayong Zhang, Bowen Hao, Su-Huai Wei, Igor Žutić, Tong Zhou
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引用次数: 0

摘要

具有自旋分裂和消失磁化特性的互变磁体,具有许多令人着迷的现象和潜在的应用前景。特别是将铁电性与交变磁性相结合,实现磁电耦合和自旋的电控制,引起了人们的广泛关注。然而,它的实验实现和精确的自旋操纵仍然是难以捉摸的。在这里,通过关注分子铁电体,第一个被发现的铁电体以其高度可控的分子极化和结构灵活性而闻名,我们揭示了这些障碍可以通过在大量制造的有机材料中出现的具有可调谐自旋极化的多铁性交磁体来消除。利用基于对称的设计和紧密结合模型,我们揭示了这种分子铁电交替磁体的潜在机制,并展示了非共线分子极化如何开关自旋极化,甚至反转其符号,正如磁光克尔效应所检测到的那样。从第一性原理计算中,我们验证了这些材料在一系列成熟的混合有机-无机钙钛矿和金属-有机框架中的可行性。我们的发现连接了分子铁电学和交变自旋电子学,突出了多功能有机多铁学的未开发潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Emergent multiferroic altermagnets and spin control via noncollinear molecular polarization

Altermagnets, with spin splitting and vanishing magnetization, have been attributed to many fascinating phenomena and potential applications. In particular, integrating ferroelectricity with altermagnetism to enable magnetoelectric coupling and electric control of spin has drawn significant attention. However, its experimental realization and precise spin manipulation remain elusive. Here, by focusing on molecular ferroelectrics, the first discovered ferroelectrics renowned for their highly controllable molecular polarizations and structural flexibility, we reveal that these obstacles can be removed by an emergent multiferroic altermagnet with tunable spin polarization in a large class of fabricated organic materials. Using a symmetry-based design and a tight-binding model, we uncover the underlying mechanism of such molecular ferroelectric altermagnets and demonstrate how noncollinear molecular polarization can switch the spin polarization on and off and even reverse its sign, as detectable by the magneto-optical Kerr effect. From the first-principles calculations, we verify the feasibility of these materials in a series of well-established hybrid organic-inorganic perovskites and metal-organic frameworks. Our findings bridge molecular ferroelectrics and altermagnetic spintronics, highlighting an unexplored potential of multifunctional organic multiferroics.

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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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