Unveiling magnetism in individual CuCrP2S6 flakes by magnetic proximity effect

Two-dimensional (2D) multiferroic CuCrP2S6 shows great potential in nonvolatile devices, in which its possible magnetoelectric coupling also allows for spin manipulation using multiple degrees-of-freedom. However, local measurements on individual 2D CuCrP2S6 remain limited mainly due to its insulating nature at low temperature. Here, we report the experimental observation of anomalous Hall effect in the CuCrP2S6/few-layer graphene bilayer structures taking advantage of magnetic proximity effect. We find that the saturation field of anomalous Hall effect is significantly smaller than that of bulk CuCrP2S6, which is believed to result from the charge transfer between CuCrP2S6 and few-layer graphene. Density functional theory calculation further reveals that the coupling between CuCrP2S6 and few-layer graphene results in the exchange splitting in graphene. Our work not only sheds light on the magnetism of individual 2D CuCrP2S6 but also paves the way toward emerging 2D heterostructures for novel magnetoelectric coupling.

[1]  T. Zhai,et al.  Electrical and magnetic anisotropies in van der Waals multiferroic CuCrP2S6 , 2023, Nature Communications.

[2]  Haoliang Liu,et al.  Large and Robust Exchange Bias in Co/CoO film: Implication for Flexible Spintronics , 2022, Advanced Physics Research.

[3]  P. Sharma,et al.  Ferroelectric order in van der Waals layered materials , 2022, Nature Reviews Materials.

[4]  R. Sankar,et al.  Tunable Ferroelectricity in Van der Waals Layered Antiferroelectric CuCrP2S6 , 2022, Advanced Functional Materials.

[5]  L. Hollenberg,et al.  Varied Magnetic Phases in a van der Waals Easy-Plane Antiferromagnet Revealed by Nitrogen-Vacancy Center Microscopy. , 2022, ACS nano.

[6]  S. Guda,et al.  Observation of Spin‐Induced Ferroelectricity in a Layered van der Waals Antiferromagnet CuCrP2S6 , 2022, Advanced Electronic Materials.

[7]  P. Xiang,et al.  Nanoscale Mapping of Cu‐Ion Transport in van der Waals Layered CuCrP2S6 , 2021, Advanced Materials Interfaces.

[8]  A. Pan,et al.  Spin‐Orbit Torque in Van der Waals‐Layered Materials and Heterostructures , 2021, Advanced science.

[9]  Yujia Zeng,et al.  Review on Recent Developments in 2D Ferroelectrics: Theories and Applications , 2021, Advanced materials.

[10]  Andrei Kirilyuk,et al.  The 2020 magnetism roadmap , 2020, Journal of Physics D: Applied Physics.

[11]  Kang L. Wang,et al.  Large exchange splitting in monolayer graphene magnetized by an antiferromagnet , 2020 .

[12]  B. V. van Wees,et al.  Electrical and thermal generation of spin currents by magnetic bilayer graphene , 2020, Nature Nanotechnology.

[13]  Seungho Kim,et al.  Gate-Tunable Reversible Rashba-Edelstein Effect in a Few-Layer Graphene/2H-TaS2 Heterostructure at Room Temperature. , 2020, ACS nano.

[14]  Bogdan Karpiak,et al.  Gate-tunable spin-galvanic effect in graphene-topological insulator van der Waals heterostructures at room temperature , 2019, Nature Communications.

[15]  Kenji Watanabe,et al.  Spin-Split Band Hybridization in Graphene Proximitized with α-RuCl3 Nanosheets. , 2019, Nano letters.

[16]  Eun Mi Kim,et al.  Multiferroicity in atomic van der Waals heterostructures , 2019, Nature Communications.

[17]  Yujia Zeng,et al.  Intrinsic Van Der Waals Magnetic Materials from Bulk to the 2D Limit: New Frontiers of Spintronics , 2019, Advanced materials.

[18]  R. Wu,et al.  Probing Magnetism in Insulating Cr2Ge2Te6 by Induced Anomalous Hall Effect in Pt. , 2019, Nano letters.

[19]  Xiang Zhang,et al.  Two-dimensional magnetic crystals and emergent heterostructure devices , 2019, Science.

[20]  Dmitri E. Nikonov,et al.  Scalable energy-efficient magnetoelectric spin–orbit logic , 2018, Nature.

[21]  Xiaofeng Qian,et al.  Two-dimensional multiferroic semiconductors with coexisting ferroelectricity and ferromagnetism , 2018, Applied Physics Letters.

[22]  Yongqing Li,et al.  Two-component anomalous Hall effect in a magnetically doped topological insulator , 2018, Nature Communications.

[23]  Michael A. McGuire,et al.  Electrical control of 2D magnetism in bilayer CrI3 , 2018, Nature Nanotechnology.

[24]  S. Roche,et al.  Tailoring magnetic insulator proximity effects in graphene: first-principles calculations , 2016, 1610.09554.

[25]  Z. Zanolli.  Graphene-multiferroic interfaces for spintronics applications , 2016, Scientific Reports.

[26]  Nan Zhang,et al.  Electric field control of deterministic current-induced magnetization switching in a hybrid ferromagnetic/ferroelectric structure. , 2016, Nature materials.

[27]  P. Wei,et al.  Strong interfacial exchange field in the graphene/EuS heterostructure. , 2015, Nature materials.

[28]  A. Rushforth,et al.  Electrical switching of an antiferromagnet , 2015, Science.

[29]  Zhiwei Hu,et al.  Direct observation of rotatable uncompensated spins in the exchange bias system Co/CoO-MgO. , 2013, Nanoscale.

[30]  Shan X. Wang,et al.  Electric-field control of local ferromagnetism using a magnetoelectric multiferroic. , 2008, Nature materials.

[31]  N. Mathur,et al.  Multiferroic and magnetoelectric materials , 2006, Nature.

[32]  P. Colombet,et al.  Structural aspects and magnetic properties of the lamellar compound Cu0.50Cr0.50PS3 , 1982 .

[33]  M. Wuttig,et al.  Epitaxial BiFeO 3 Multiferroic Thin Film Heterostructures , 2019 .

[34]  Andrew M Rappe,et al.  Ferroelectric polarization reversal via successive ferroelastic transitions. , 2015, Nature materials.