首页|Tunable magneto-Seebeck effect in Co2FeSi/MgO/Co2FeSi heterostructure via optimized interfacial engineering

Tunable magneto-Seebeck effect in Co2FeSi/MgO/Co2FeSi heterostructure via optimized interfacial engineering

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Enhancing the tunneling magneto-Seebeck(TMS)ratio and uncovering its underlying mechanism are greatly demanded in spin caloritronics.The magnitude and sign of the TMS effect depend on the type of atom and the stacking order of atoms at the inter-faces.Herein,we demonstrate that TMS ratios can be effectively manipulated by altering heterogonous or homogeneous interface through decoration on the CoFeSi(001)surface inserted on the MgO insulating layers.The maximum TMS ratio of pure Co2/O termination is 4565％at 800 K.Notably,the TMS ratio of the FeSi/O termination has two peak values,of which the maximum could reach up to-3290％at 650 K.By comparing two different atom arrangements at the interface,we reveal that the sign and symbol of the TMS ratio can be controlled by the temperature and different atomic configurations at the Co2FeSi/MgO interface.Furthermore,the spin-Seebeck coefficient up to～150 μV/K is also possible when we select suitable terminations and temper-atures.These findings will provide useful insights into how to control the sign and symbol of the TMS ratio and accordingly stimulate the development field of magneto-thermoelectric power and spin caloritronic devices based on the magneto-Seebeck effect in Heusler-based metallic multilayers.

magneto-Seebeck effectinterfacespintronicselectronic structurespin-Seebeck effect

Jingyu Li、Xianbiao Shi、Yurong Jin、Le Ma、Liuming Wei、Chi Zhang、Hang Li、Peng-Fei Liu

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International Joint Research Laboratory of New Energy Materials and Devices of Henan Province,School of Physics and Electronics,Henan University Kaifeng 475004,China

Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

Spallation Neutron Source Science Center,Dongguan 523803,China

Defence Industry Secrecy Examination and Certification Center

Beijing 100089,China

School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

Department of Network Security,Henan Police College,Zhengzhou 450046,China

College of Electrical Engineering,Henan University of Technology,Zhengzhou 450001,China

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国家自然科学基金Foshan(Southem China)Institute for New Materials

121044582021AYF25021

2024

10.1007/s11433-023-2265-9

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(3)
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