当前位置:首页>深圳>深圳大学曾昱嘉教授 Adv.Funct.Mater.:范德华Fe3GaTe2/Fe3GeTe2双层异质结构中的大反对称磁阻效应

深圳大学曾昱嘉教授 Adv.Funct.Mater.:范德华Fe3GaTe2/Fe3GeTe2双层异质结构中的大反对称磁阻效应

  • 2026-04-18 21:36:32
深圳大学曾昱嘉教授 Adv.Funct.Mater.:范德华Fe3GaTe2/Fe3GeTe2双层异质结构中的大反对称磁阻效应
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深圳大学曾昱嘉教授等人发表题为Spin-Orbit Torque Controlled Large Antisymmetric Magnetoresistance in van der Waals Fe3GaTe2/Fe3GeTe2 Bilayer Heterostructure”于Advanced Functional Materials上

随着现代自旋电子学的发展,磁阻效应(MR)如巨磁阻(GMR)和隧道磁阻(TMR)在信息存储领域扮演了核心角色。然而,传统的GMR和TMR主要依赖于磁化方向的反平行和平行排列来实现高阻和低阻状态,这限制了存储密度的进一步提升。多态存储单元作为一种替代方案,通过设计特殊的磁结构或形状来实现,但增加了制造复杂性和集成难度。非对称磁阻效应(AMR)因其能展现高、中、低三个不同的电阻状态而备受关注,尤其在多态存储、逻辑电路和高性能计算中展现出巨大潜力。然而,AMR效应通常较弱且难以操控,限制了其实际应用。近年来,二维(2D)范德华(vdW)材料的兴起为探索各种磁阻效应提供了新的平台,特别是具有强自旋轨道耦合(SOC)和垂直磁各向异性的铁磁材料,如Fe3GeTe2和Fe3GaTe2,为AMR的研究注入了新的活力。

本研究旨在设计并探索一种基于vdW Fe3GaTe2/Fe3GeTe2异质结构的新型AMR效应,通过电流诱导的自旋轨道扭矩(SOT)来控制AMR行为。研究团队首先合成了高质量的Fe3GeTe2(FGeT)和Fe3GaTe2(FGaT)单晶,并通过化学气相传输法确保了材料的纯净度。随后,利用机械剥离和干转移技术,将FGeT和FGaT纳米片堆叠在一起,构建了FGaT/FGeT异质结构,并用厚层六方氮化硼(h-BN)封装以保护样品免受环境影响。

    图1展示了FGaT/FGeT异质结构的基本表征结果。X射线衍射(XRD)图谱(图1a)显示了FGeT和FGaT单晶的高质量,与先前报道一致。晶体结构图(图1b)揭示了Fe3Ga和Fe3Ge层被两个相邻的Te层夹在中间,形成P63/mmc空间群,并沿c轴堆叠成层状结构。图1c为异质结构器件的示意图,展示了器件的层次结构和测量配置。光学图像(图1d)显示了典型的FGaT/FGeT异质结构器件,封装在顶部的h-BN层下。TEM横截面图像(图1e)和相应的EDS元素映射进一步证实了FGeT和FGaT的层状结构,并揭示了界面处可能的结构重构或元素分布不均匀性。这些结果为后续磁输运性质的研究提供了坚实的基础。

    图2详细展示了FGaT/FGeT异质结构在不同温度下的磁输运性质。图2a和2b分别展示了在5K时,器件的霍尔电阻(Rxy)和纵向磁阻(MR)随磁场的变化。Rxy曲线在临界磁场处出现尖锐的下降,导致MR曲线呈现四态AMR效应,且为反对称的MR平台。这一现象与传统的GMR行为截然不同,表明异质结构中存在独特的磁输运机制。图2c和2d进一步展示了不同温度下Rxx和Rxy的变化,揭示了AMR效应随温度升高的减弱趋势。图2e和2f总结了温度对MR比和AMR平台宽度的影响,以及临界磁场随温度的变化,表明磁各向异性的热软化是导致AMR效应减弱的主要原因。

    为了深入理解AMR效应的起源,研究团队通过改变FGeT和FGaT层的堆叠顺序(图3a)以及电流方向(图3c)来研究AMR的依赖性。图3a显示,当堆叠顺序反转时,高阻和低阻平台也随之反转,表明AMR效应与层的堆叠顺序密切相关。图3b展示了器件在不同旋转角度下的MR行为,发现AMR的幅度与角度无关,但高阻和低阻状态所需的磁场随角度增加而增大。图3c进一步揭示了AMR效应对电流方向的强烈依赖性,表明自旋动量锁定在AMR效应中扮演了关键角色。这些发现为理解AMR效应的物理机制提供了重要线索。

    图4展示了电流对FGaT/FGeT异质结构中AMR行为的非挥发性调控。图4a显示,随着电流的增加,FGaT和FGeT层的矫顽力显著降低,导致MR平台的宽度显著减小。这一现象可归因于电流诱导的焦耳加热效应和SOT效应的共同作用。图4b通过测量Rxx随温度的变化,估算了焦耳加热对样品温度的实际影响。图4c和4d进一步量化了电流对矫顽力的影响,并区分了焦耳加热和非焦耳加热(即SOT)的贡献。令人惊讶的是,研究团队发现SOT场在异质结构中异常大,表明界面自旋动量锁定能够产生可观的自旋电流,进而导致大的界面SOT和MR比。

    图5展示了基于FGaT/FGeT异质结构的计算内存(CIM)处理器在图像分类和低温量子比特状态识别中的高性能应用。图5a为FGaT/FGeT交叉阵列执行矩阵向量乘法(MVM)操作的示意图,展示了CIM处理器的基本工作原理。图5b和5d分别展示了在CIFAR-10、MNIST和Fashion-MNIST数据集上的图像分类准确率,表明基于FGaT/FGeT的CIM处理器在图像分类任务中表现出色。图5c和5e则展示了在单量子比特状态识别任务中的高准确率,进一步证明了该处理器在量子计算领域的潜力。图5f还展示了在不同权重读取噪声水平下的状态识别准确率,表明该处理器具有较高的抗噪声能力。

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    https://doi.org/10.1002/adfm.75340

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    1. CONNECT:[ UseTime:0.000593s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000857s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000284s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000524s ]
    6. SELECT * FROM `set` [ RunTime:0.000203s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000576s ]
    8. SELECT * FROM `article` WHERE `id` = 549279 LIMIT 1 [ RunTime:0.000513s ]
    9. UPDATE `article` SET `lasttime` = 1777478656 WHERE `id` = 549279 [ RunTime:0.012860s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000408s ]
    11. SELECT * FROM `article` WHERE `id` < 549279 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000615s ]
    12. SELECT * FROM `article` WHERE `id` > 549279 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011969s ]
    13. SELECT * FROM `article` WHERE `id` < 549279 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007624s ]
    14. SELECT * FROM `article` WHERE `id` < 549279 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010165s ]
    15. SELECT * FROM `article` WHERE `id` < 549279 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001102s ]
    0.119954s