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二维磁性材料是二维材料家族的新成员, 其在单原胞层厚度依然保持长程磁序且易受外场调控, 这为二维极限下的磁性以及其他新奇物理效应的研究提供了理想的平台, 又为低功耗自旋电子学/磁存储器件的研制开辟了新的途径, 成为国际上备受关注的前沿热点. 本综述首先系统介绍了近年来发现的各类本征二维磁性材料的晶体结构、磁结构以及磁性能, 并讨论了由磁场、电场、静电掺杂、离子插层、堆叠方式、应变、界面等外场调控二维磁性材料磁性能的研究进展, 最后进行总结并展望了二维磁性材料未来发展的研究方向. 深入理解二维磁性材料磁性的起源和机理、研究其磁性能与微观结构之间的关联, 为寻找具有更高居里温度(奈尔温度)的磁性材料、设计多功能的新概念器件具有重要意义.The recently discovered two-dimensional magnetic materials have attracted tremendous attention and become a cutting-edge research topic due to their long-range magnetic ordering at a single-unit-cell thickness, which not only provide an ideal platform for studying the magnetism in the two-dimensional limit and other novel physical effects, but also open up a new way to develop low-power spintronics/magnetic storage devices. In this review, first, we introduce the crystal structures, magnetic structures and magnetic properties of various recently discovered intrinsic two-dimensional magnetic materials. Second, we discuss the research progress of controlling the magnetic properties of two-dimensional magnetic materials by magnetic field, electric field, electrostatic doping, ion intercalation, stacking, strain, interface, etc. Finally, we give a perspective of possible research directions of the two-dimensional magnetic materials. We believe that an in-depth understanding of the origin and mechanism of magnetism of the two-dimensional magnetic materials as well as the study of the relationship between magnetic properties and microstructures are of great significance in exploring a magnetic material with a substantially high Curie temperature (Néel temperature), and designing multifunctional new concept devices.
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图 1 不同FM和AFM自旋磁矩的示意图, 以磁性过渡金属离子为代表进行描述(自旋向上的磁矩为浅灰色, 自旋向下的磁矩为深灰色) (a) FM耦合; (b)层间A-type AFM耦合[35]; (c)层内AF-zigzag耦合[35]; (d)层内AF-stripy耦合[35]; (e)层内AF-Néel耦合[35]
Fig. 1. Various types of FM and AFM order in layered magnetic materials, represented by magnetic transition metal ions (light grey and dark grey represent spin up and spin down, respectively). From left to right: (a) FM order; (b) interlayer A-type AFM order[35]; (c) intralayer AF-zigzag order[35]; (d) intralayer AF-stripy order[35]; (e) intralayer AF-Néel order[35].
图 2 (a) 单层CrX3的俯视图(左), Cr3+ (紫色)和X-(金色)组成的八面体笼(右)[43]; (b) 在低温菱方相的坐标系中CrX3的磁结构. 目前研究只报道CrCl3的磁矩在ab平面上, 在这里沿[110]和[
$\bar {1}\bar {1}0$ ]方向画出; 在CrBr3和CrI3中, 磁矩沿c轴[44]Fig. 2. (a) Top view of a CrX3 monolayer along with an illustration of the coordination (left), and Cr3+ (purple) and X– (gold) in an octahedral cage (right)[43]; (b) magnetic structures of CrX3 in the coordinate system of the low temperature rhombohedral structure. The moments in CrCl3 are drawn along the [110] and [
$\bar {1}\bar {1}0$ ] directions here, but are only known to be in the ab plane. Moments in ferromagnetic CrBr3 and CrI3 are along the c axis[44].图 11 (a) 过渡金属卤化物的俯视图; (b) 4个氧和2个卤化物离子配位过渡金属离子形成强扭曲八面体结构图(顶部)和过渡金属卤化物的侧视图(底部)[91]
Fig. 11. (a) Top view of transition-metal oxyhalides; (b) a strongly distorted octahedron formed by one metal ion coordinated by 4 oxygen and 2 halide ions (top), the side view of transition-metal oxyhalides (bottom)[91].
图 12 (a)双层反铁磁CrI3中MCD信号随磁场的变化[16]; (b) 在H // (0001) 和H⊥(0001) 方向MnBi2Te4依赖磁场的磁化曲线(HSF为自旋-翻转磁场)[84]; (c) 双层反铁磁CrI3的线性磁电效应[40]: 在一个固定的磁场下磁化的样品的磁化强度的相对和绝对变化(分别为ΔM/M0和ΔM)随施加电场的变化; (d) H // c方向、不同温度下MnBi4Te7等温磁化的磁滞回线, Hf, 一级自旋翻转场[107]
Fig. 12. (a) MCD signal in AFM bilayer CrI3 as a function of magnetic field[16]; (b) field-dependent magnetization curves of MnBi2Te4 for H // (0001) and H⊥(0001), where HSF is spin-flop magnetic field[84]; (c) linear magnetoelectric effect in AFM bilayer CrI3[40]: relative and absolute changes in the sheet magnetization (ΔM/M0 and ΔM, respectively) as a function of applied electric field measured under a fixed magnetic field; (d) full magnetic hysteresis loop of isothermal magnetization of MnBi4Te7 taken at various temperatures for H // c, Hf, first-order spin-flip transition field[107].
图 13 (a) 双栅控双层CrI3器件结构示意图[39]; (b), (c) 静电掺杂控制单层(b)和双层(c) CrI3的磁性[105], 其中(b)是以零栅压下相应值归一化的矫顽场(洋红色)、饱和场(紫色)、居里温度(橙色)与栅压(底轴)及掺杂浓度(顶轴)的关系, 正(负)值分别代表电子(空穴)浓度, (c) 4 K下掺杂浓度-磁场决定的双层CrI3相图
Fig. 13. (a) Schematic of a dual-gated bilayer CrI3 device[39]. (b), (c) Controlling magnetism in monolayer (b) and bilayer CrI3 (c) by electrostatic doping[105]: (b) Coercive force (magenta), saturation magnetization (purple) (both at 4 K) and Curie temperature (orange) normalized by their values at zero gate voltage as a function of gate voltage (bottom axis) and induced doping density (top axis) with positive (negative) value for electron (hole) density; (c) doping density-magnetic field phase diagram of bilayer CrI3 at 4 K.
图 14 离子插层实验结果 (a), (b) Cr2Ge2Te6有机阳离子插层的实验结果[112], 其中(a) Cr2Ge2Te6和 (TBA) Cr2Ge2Te6晶体结构示意图; (b) 纯Cr2Ge2Te6和 (TBA) Cr2Ge2Te6在H // ab方向磁化强度随温度(左)及(TBA) Cr2Ge2Te6在H // ab方向磁化强度随磁场(右)的变化; (c), (d) Fe3GeTe2锂离子插层的实验结果[38], 其中(c) Fe3GeTe2器件结构示意图, 电解质(LiClO4溶解在聚氧乙烯中)覆盖Fe3GeTe2薄片和侧栅; (d) 3层Fe3GeTe2的居里温度随栅极电压的变化
Fig. 14. Experimental results of ion intercalation. (a), (b) Results of the organic cation intercalation for Cr2Ge2Te6[112]: (a) Schematic diagrams of crystal structures of Cr2Ge2Te6 and (TBA) Cr2Ge2Te6; (b) temperature-dependent magnetization (M-T) of pristine Cr2Ge2Te6 and (TBA) Cr2Ge2Te6 for H//ab (left) and magnetic field-dependent magnetization (M-H) of (TBA) Cr2Ge2Te6 for H//ab (right). (c), (d) Results of the Li+ intercalation for Fe3GeTe2[38]: (c) Schematic of the Fe3GeTe2 device structure, the electrolyte (LiClO4 dissolved in polyethylene oxide) covers both Fe3GeTe2 flake and side gate; (d) Curie temperature of the tri-layer Fe3GeTe2 as a function of the gate voltage.
图 15 CrI3压力调控的实验结果[52] (a) CrI3的菱方相和单斜相的俯视图(左)和侧视图(右), 其中绿(紫)色原子分别代表顶层(底层)的Cr原子, 棕色原子代表I原子; (b)高压实验装置示意图; (c)在不同静水压力下, 隧穿电流It随磁场的变化关系
Fig. 15. Experimental results of CrI3 under hydrostatic pressure[52]: (a) Schematic of rhombohedral stacking and monoclinic stacking with top (left) and side (right) view, the green (purple) atoms represent the Cr atoms in the top (bottom) layer while the brown ones represent the I atoms; (b) schematic of high-pressure experimental set-up; (c) tunneling current, It, versus magnetic field, H, at different pressures.
图 16 CrBr3自旋极化STM的实验结果[115], 其中(a), (b)分别为H型堆叠(a)和R型堆叠(b)的单层(1L)和双层(2L)区域的STM图以及高分辨的原子图像; (c) SP-STM测量示意图; (d), (e) 利用Cr针尖测得的H型堆叠(d)和R型堆叠(e)双层CrBr3的自旋-极化隧穿与磁场的关系, 黑色(红色)曲线对应面外磁场正向(反向)扫描的结果
Fig. 16. Experimental results of spin-polarized STM for CrBr3[115]. (a), (b) STM images of H-type stacked (a) and R-type stacked (b) CrBr3 films with both a monolayer (1L) region and a bilayer (2L) island. Magnified, atomically resolved images of the bilayer island and its extended bottom region of the H-type stacked and R-type stacked CrBr3 films are resolved. (c) Schematic of SP-STM measurement. (d), (e) Spin-polarized tunneling on the H-type stacked (d) and R-type stacked (e) CrBr3 bilayer as a function of magnetic field with a Cr tip. The out-of-plane magnetic field was swept upward (black curve) and downward (red curve).
图 17 Fe3GeTe2的应力调控[120] (a) 应变实验装置示意图; (b) 1.5 K下矫顽场随应力的变化关系; (c) 剩余反常霍尔电阻
$R_{xy}^{\rm r}$ (由165 K的值归一化)在不同压力下随温度的变化关系Fig. 17. Straining regulation of Fe3GeTe2[120]: (a) Schematic diagram of device in the strain experimental set-up; (b) coercive field as a function of strain at 1.5 K; (c) remnant anomalous Hall resistance
$R_{xy}^{\rm r}$ normalized by the values at 165 K as a function of temperature with varying strain.图 18 (a), (b) FePS3/Fe3GeTe2异质结的实验结果[121], 其中(a)为FePS3, Fe3GeTe2薄片中的磁序; (b) Fe3GeTe2 (红线), FePS3/Fe3GeTe2 (蓝线)的Kerr角度随温度的变化; (c), (d) Bi2Te3/Fe3GeTe2异质结的实验结果[122], 其中(c) Bi2Te3和Fe3GeTe2晶体结构示意图; (d) Bi2Te3(8)/Fe3GeTe2(4)异质结在不同温度下的反常霍尔电阻, 数字表示样品的厚度; (e), (f) 纯Cr2Ge2Te6 (e)及沉积50 nm NiO后的Cr2Ge2Te6/NiO (f) MOKE信号随温度的变化曲线[123]
Fig. 18. (a), (b) Experimental results of FePS3/Fe3GeTe2[121]: (a) Magnetic ordering in vdW Fe3GeTe2 and FePS3 thin flakes; (b) extracted Kerr rotations as a function of the temperature for Fe3GeTe2 (red curve) and FePS3/Fe3GeTe2 (blue curve), respectively. (c), (d) Experimental results of Bi2Te3/Fe3GeTe2[122]: (c) Schematic structures of Bi2Te3 and Fe3GeTe2; (d) anomalous Hall resistances of the Bi2Te3(8)/Fe3GeTe2(4) heterostructure at different temperatures, respectively, the number represents the thickness of the sample. (e), (f) Temperature dependence of MOKE signals of the Cr2Ge2Te6 without (e) and with (f) NiO capping layer[123].
表 1 常见的磁性材料及其磁性质
Table 1. A list of typical magnetic materials and their magnetic properties.
材料类别 材料 磁耦合 磁转变温度TN/Tc 描述模型 带隙/eV 参考文献 过渡金属
卤化物CrCl3 A-type AFM 1L: 10 K/Tc
2L: 16 K/TN
Bulk: 17 K/TN//XY 3.0 [44,46,47] CrBr3 FM 1L: 27 K/Tc
2L: 36 K/Tc
Bulk: 37 K/Tc⊥between Isingand Heisenberg 2.2 [44,45,47] CrI3 A-type AFM/Few L 1L: 45 K/Tc
2L: 45 K/TN
Few L: 46 K/TN⊥Ising 1.2 [44,45,47,48] FM/Bulk Bulk: 61 K/Tc 1T-FeCl2 A-type AFM/Bulk Bulk: 24 K/TN ⊥ [44] FM/1L 1L: 109 K/Tc ⊥Heisenberg Semimetal [55] 1T-FeBr2 A-type AFM/Bulk Bulk: 14 K/TN ⊥ [44] FM/1L 1L: 81 K/Tc ⊥Heisenberg Semimetal [55] 1T-FeI2 Intralayer AF-stripy/Bulk Bulk: 9 K/TN ⊥ [44] FM/1L 1L: 42 K/Tc ⊥Heisenberg Semimetal [55] 1T-CoCl2 AFM/Bulk Bulk: 25 K/TN // [44] FM/1L 1L: 85 K/Tc Heisenberg [55] 1T-CoBr2 A-type AFM/Bulk Bulk: 19 K/TN // [44] FM/1L 1L: 23 K/Tc Heisenberg [55] 1T-CoI2 AFM Bulk: 11 K/TN [44] NiI2 A-type AFM 2.0 nm: 35 K/TN
Bulk: 75 K/TN1.11/1L
1.23/Bulk[29] 过渡金属
硫化物CrSe# FM Bulk: 280 K/Tc [21] CrTe2# FM Bulk: 310 K/Tc 0 [97] CrTe FM 11 nm: 140 K/Tc
45 nm: 205 K/Tc⊥ 0 [19] Cr2Te3 FM 5 nm: 280 K/Tc
40.3 nm: 170 K/Tc⊥ 0 [57] FeTe (hexagonal) FM 4 nm: 170 K/Tc
Bulk: 220 K/TcHeisenberg [20] ${\rm MnSe}_x{}^*$ FM/1L 1L: > 300 K/Tc ⊥ 3.39 [61] AFM/Bulk 1T-VSe2* FM/1L 1L: > 300 K (470 K)/Tc // 0 [22,60] 2H-VSe2 A-type AFM // Semimetal [98] V5S8 FM/3.2 nm 3.2 nm: 2 K/Tc ⊥ 0 [99] AFM/Bulk Bulk: 32 K/TN FeTe (tetragonal) AFM-Néel 5 nm: 45 K/TN
Bulk: 70 K/TNHeisenberg [20] Cr2S3 FM 15 nm: 120 K/Tc
45 nm: 300 K/Tc[59] Cr2O3# AFM Bulk: 307 K/ TN ⊥ 3.5 [100,101] 过渡金属磷
化合物FePS3 Intralayer AF-zigzag, interlayer FM 1L: 118 K/TN
Bulk: 118 K/TN⊥Ising 1.5 [30,65,72] NiPS3 Intralayer AF-zigzag, interlayer FM 2L: 130 K/TN
Bulk: 150 K/TN// XY 1.6 [31,65,67] MnPS3 Intralayer AF-Néel, interlayer FM Bulk: 78 K/TN // Heisenberg 2.4 [65,68,71] CoPS3 Intralayer AF-zigzag, interlayer FM Bulk: 120 K/TN // XY [66] MnPSe3 Intralayer AF-zigzag, interlayer FM 5L: 70 K/TN
Bulk: 70 K/TN// XY 2.3 [32] FePSe3# Intralayer AF-zigzag, interlayer FM Bulk: 119 K/TN ⊥Ising 1.3 [73,74] CrPS4 A-type AFM Bulk: 36 K/TN ⊥ 1.3 [75,76,102] FM/1L 1L: 50 K/Tc ⊥ 2.28 [77] 过渡金属锗
碲化合物Cr2Si2Te6 FM 1L: 80 K/Tc
Bulk: 31 K/Tc⊥Ising 1.2 [80,81,103] Cr2Ge2Te6 FM 2L: 28 K/Tc
3L: 35 K/Tc
Bulk: 61 K/Tc⊥Heisenberg 0.45 [17,80] Fe3GeTe2 FM 1L (onAl2O3): 20 K/Tc
1L (on Au): 130 K/Tc
Bulk: 220—230 K/Tc⊥Ising 0 [38,82] Fe5GeTe2 FM 12 nm: 270—300 K/Tc
Bulk: 310 K/Tc⊥ 0 [26] 过渡金属铋
碲化合物MnBi2Te4 A-type AFM 3SL: 18 K/TN
4SL: 21 K/TN
Bulk: 25 K/TN⊥Heisenberg [84,85] MnBi4Te7 A-type AFM Bulk: 13 K/TN ⊥ [89] MnBi6Te10 A-type AFM Bulk: 11 K/TN ⊥ [89] VBi2Te4 A-type AFM // [90,104] NiBi2Te4 A-type AFM // [90] EuBi2Te4 A-type AFM // [90] 过渡金属氧
卤化物FeOCl AFM 2.0—2.4 nm: 14 K/TN
Bulk: 84—92 K/TN[34] CrOCl FM/1L 1L: 160 K/Tc ⊥Ising 2.38 [91] AFM Bulk: 13.5 K/TN ⊥ 2.31 [96] CrSBr FM/1L 1L: 160 K/Tc // Heisenberg 0.757 [93] CrSCl FM/1L 1L: 150 K/Tc // Heisenberg 0.856 [93] CrSI FM/1L 1L: 170 K/Tc // Heisenberg 0.473 [93] 注: 绿色背底表示为实验中发现的铁磁材料, 橙色背底表示为实验中发现的反铁磁材料, 灰色背底表示为理论预测的铁磁或反铁磁材料; 上标#为体相材料, 其单层磁性在实验中还未发现; 上标*为磁性是否为本征磁性尚未确定的磁性材料; ⊥表示易磁化轴垂直于平面(ab), ∥表示易磁化轴平行于平面(ab). -
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