首页|Magnetic domain structures in ultrathin Bi2Te3/CrTe2 heterostructures

Magnetic domain structures in ultrathin Bi2Te3/CrTe2 heterostructures

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Chromium tellurium compounds are important two-dimensional van der Waals ferromagnetic materials with high Curie temperature and chemical stability in air,which is promising for applications in spintronic devices.Here,high-quality spin-orbital-torque(SOT)device,Bi2Te3/CrTe2 heterostructure was epitaxially grown on Al2O3(0001)substrates.Anomalous Hall measurements indicate the existence of strong ferromagnetism in this device with the CrTe2 thickness down to 10 nm.In order to investigate its micromagnetic structure,cryogenic magnetic force microscope(MFM)was utilized to measure the magnetic domain evolutions at various temperatures and magnetic fields.The virgin domain state of the device shows a worm-like magnetic domain structure with the size around 0.6 μm-0.8 μm.Larger irregular-shape magnetic domains(＞1 μm)can be induced and pinned,after the field is increased to coercive field and ramped back to low fields.The temperature-dependent MFM signals exhibit a nice mean-field-like ferromagnetic transition with Curie temperature around 201.5 K,indicating a robust ferromagnetic ordering.Such a device can be potentially implemented in future magnetic memory technology.

CrTe2magnetic domainmagnetic force microscopy

夏体瑞、杨笑天、张逸凡、刘馨琪、蔡新雨、刘畅、姚岐、寇煦丰、王文波

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School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China

School of Information Science and Technology,ShanghaiTech University,Shanghai 201210,China

ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China

Department of Materials Science,Fudan University,Shanghai 200438,China

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National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaFund from the Science and Technology Commission of Shanghai MunicipalityNational Natural Science Foundation of ChinaRisingStar Program of ShanghaiOpen Fund of State Key Laboratory of Infrared Physics

2022YFA14030001237416121PJ4108009216410421QA1406000

2024

10.1088/1674-1056/ad4a3a

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(8)