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Liu W, Zhou Q, Chen Q, Niu D, Zhou Y, Xu Y, Zhang R, Wang J, van der Laan G. Probing the Buried Magnetic Interfaces. ACS APPLIED MATERIALS & INTERFACES 2016; 8:5752-5757. [PMID: 26887429 DOI: 10.1021/acsami.5b11438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Understanding magnetism in ferromagnetic metal/semiconductor (FM/SC) heterostructures is important to the development of the new-generation spin field-effect transistor. Here, we report an element-specific X-ray magnetic circular dichroism study of the interfacial magnetic moments for two FM/SC model systems, namely, Co/GaAs and Ni/GaAs, which was enabled using a specially designed FM1/FM2/SC superstructure. We observed a robust room temperature magnetization of the interfacial Co, while that of the interfacial Ni was strongly diminished down to 5 K because of hybridization of the Ni d(eg) and GaAs sp(3) states. The validity of the selected method was confirmed by first-principles calculations, showing only small deviations (<0.02 and <0.07 μB/atom for Co/GaAs and Ni/GaAs, respectively) compared to the real FM/SC interfaces. Our work proved that the electronic structure and magnetic ground state of the interfacial FM2 is not altered when the topmost FM2 is replaced by FM1 and that this model is applicable generally for probing the buried magnetic interfaces in the advanced spintronic materials..
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Affiliation(s)
- Wenqing Liu
- York-Nanjing Joint Center for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University , Nanjing 210093, China
- Spintronics and Nanodevice Laboratory, Department of Electronics, University of York , York YO10 5DD, U.K
- Department of Physics, The University of Hong Kong , Pokfulam, Hong Kong
| | - Qionghua Zhou
- Department of Physics, Southeast University , Nanjing 211189, China
| | - Qian Chen
- Department of Physics, Southeast University , Nanjing 211189, China
| | - Daxin Niu
- Spintronics and Nanodevice Laboratory, Department of Electronics, University of York , York YO10 5DD, U.K
| | - Yan Zhou
- York-Nanjing Joint Center for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University , Nanjing 210093, China
- Department of Physics, The University of Hong Kong , Pokfulam, Hong Kong
| | - Yongbing Xu
- York-Nanjing Joint Center for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University , Nanjing 210093, China
- Spintronics and Nanodevice Laboratory, Department of Electronics, University of York , York YO10 5DD, U.K
| | - Rong Zhang
- York-Nanjing Joint Center for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University , Nanjing 210093, China
| | - Jinlan Wang
- Department of Physics, Southeast University , Nanjing 211189, China
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Liu X, Stamps RL, Sooryakumar R, Prinz GA. Spin-wave hybridization and magnetic anisotropies in a thick bcc cobalt film. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:11903-11906. [PMID: 9985026 DOI: 10.1103/physrevb.54.11903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Liu X, Steiner MM, Sooryakumar R, Prinz GA, Farrow RF, Harp G. Exchange stiffness, magnetization, and spin waves in cubic and hexagonal phases of cobalt. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:12166-12172. [PMID: 9982846 DOI: 10.1103/physrevb.53.12166] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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