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Nat. Commun. | 南京师范大学&南京大学 | 反铁磁也能“发电”?新型多铁材料解锁自旋电子新可能

  • 2026-05-28 17:50:29
Nat. Commun. | 南京师范大学&南京大学 | 反铁磁也能“发电”?新型多铁材料解锁自旋电子新可能

反铁磁也能“发电”?新型多铁材料解锁自旋电子新可能

你有没有想过,那些原本“安静无声”的反铁磁材料,其实也能像磁铁一样操控电?这听起来有点反直觉——毕竟,传统反铁磁体内部磁矩方向相反、相互抵消,既不产生外磁场,也难以与电场互动。但南京大学张海军教授与南京师范大学王怀强副教授团队的最新研究,彻底打破了这一认知。

这项成果刚刚发表于国际顶级期刊《自然·通讯》(Nature Communications),他们首次从理论上证明并计算验证:一种被称为“反磁性”(altermagnetism)的新型磁性材料,其内部的奈尔磁序(Néel order)可以直接诱导出稳定的电极化,从而实现所谓的“II型多铁性”——即磁性驱动铁电性的强耦合状态。


什么是“多铁材料”?为什么它这么重要?

多铁材料,简单说就是同时具备铁磁性和铁电性的单一物质。更关键的是,这两者还能互相影响——用电场调控磁性,或用磁场控制电极化,这种“磁电耦合”效应是未来低功耗、高速自旋电子器件的核心。

多铁材料分为两类: - I型:铁电性与磁性各自独立存在,耦合较弱; - II型铁电性由磁序直接“催生”,耦合极强,但通常要求复杂的非共线磁结构(如螺旋磁序),难以操控。

而这次研究的突破在于:在具有共线磁序(即磁矩整齐排列、方向相反)的反磁性材料中,实现了II型多铁性!这意味着,我们既能享受强磁电耦合的优势,又避开了复杂磁结构带来的控制难题。


反磁性:介于铁磁与反铁磁之间的“新物种”

反磁性(altermagnetism)是近年来凝聚态物理的热点概念。它看起来像反铁磁——整体无净磁矩、无杂散磁场;但它又像铁磁——能产生动量依赖的自旋劈裂,可用于自旋流操控。

关键区别在于对称性:传统反铁磁体中,两个磁子晶格通过空间反演对称操作相连,导致任何局部电偶极矩都会被抵消;而反磁性材料缺乏这种反演对称性,使得两个子晶格的电响应不再相互抵消,从而允许净电极化的出现。

研究团队通过对称性分析 + 金属-配体模型,从微观机制上揭示了这一过程:在自旋轨道耦合(SOC)作用下,磁性离子与其周围配体(如氮、氧)发生杂化,形成与自旋方向相关的局域电偶极。当奈尔矢量(描述反铁磁序方向的参数)确定后,这些偶极叠加起来,就产生了宏观电极化。

更妙的是,电极化方向被“锁定”在奈尔序的方向上——改变磁序方向,电极化也随之改变。这种一一对应的关系,正是II型多铁性的标志。


单层MgFe₂N₂:理论预言的“理想候选者”

为了验证理论,团队以单层MgFe₂N₂为例进行了第一性原理计算。结果令人振奋:

  • 该材料具有典型的反磁性奈尔序;
  • 计算显示其电极化强度可达 ~10 μC/cm² 量级(与许多传统铁电体相当);
  • 极化方向严格由奈尔矢量决定,符合“锁定”行为;
  • 其晶体结构属于二维层状群,满足反磁性多铁的对称性要求。

这意味着,MgFe₂N₂不仅是一个理论模型,更可能是实验上可实现的首个反磁性II型多铁材料


如何“看见”看不见的反铁磁极化?

反铁磁的一大挑战是:无法用普通磁力显微镜观测,因为它们不产生外磁场。为此,研究团队提出了一个巧妙的实验方案:利用磁光法拉第效应(magneto-optical Faraday effect)

由于反磁性材料具有动量依赖的自旋劈裂,其对偏振光的响应会随奈尔序方向变化。通过测量法拉第旋转角,不仅能识别奈尔序取向,还能间接“看到”伴随的电极化方向。这为实验验证提供了清晰路径。


未来:反磁性多铁开启自旋电子学新赛道

这项工作首次将反磁性II型多铁性两大前沿领域连接起来。其意义远不止于理论突破:

  • 器件层面
    反磁性材料具有超高频响应(太赫兹级别)、无杂散磁场、抗干扰强等优势,结合强磁电耦合,有望用于超快、低功耗存储器和逻辑器件;
  • 材料设计
    研究提出的八类对称性分类,为筛选和设计新型反磁性多铁材料提供了“路线图”;
  • 探测技术
    磁光显微方案为表征这类“隐形”磁电材料打开了大门。

正如团队所言:“这不仅是对多铁机制的拓展,更是为反磁性多功能自旋电子学奠定基础。”


那么问题来了:如果未来的手机芯片用上了这种“磁控电”的反磁性材料,会不会彻底告别发热和高耗电?欢迎在评论区聊聊你的想象!

📚 参考文献

Wen-Ti Guo, Junqi Xu, Yurong Yang, Haijun Zhang, Huaiqiang Wang. Altermagnetic type-II multiferroics with Néel-order-locked electric polarization. Nat. Commun., 2026. DOI: https://doi.org/10.1038/s41467-026-73750-5.

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#反磁性 #多铁材料 #自旋电子学 #奈尔序 #磁电耦合

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  1. CONNECT:[ UseTime:0.000523s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000654s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000271s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000539s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000522s ]
  8. SELECT * FROM `article` WHERE `id` = 571758 LIMIT 1 [ RunTime:0.000420s ]
  9. UPDATE `article` SET `lasttime` = 1780221911 WHERE `id` = 571758 [ RunTime:0.001331s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000265s ]
  11. SELECT * FROM `article` WHERE `id` < 571758 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000455s ]
  12. SELECT * FROM `article` WHERE `id` > 571758 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000398s ]
  13. SELECT * FROM `article` WHERE `id` < 571758 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001265s ]
  14. SELECT * FROM `article` WHERE `id` < 571758 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000734s ]
  15. SELECT * FROM `article` WHERE `id` < 571758 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000953s ]
0.076117s