中国物理B ›› 2019, Vol. 28 ›› Issue (3): 37501-037501.doi: 10.1088/1674-1056/28/3/037501

所属专题： Virtual Special Topic — Magnetism and Magnetic Materials

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Antiferromagnetic interlayer coupling of (111)-oriented La0.67Sr0.33MnO3/SrRuO3 superlattices

Hui Zhang(张慧), Jing Zhang(张静), Jin-E Zhang(张金娥), Fu-Rong Han(韩福荣), Hai-Lin Huang(黄海林), Jing-Hua Song(宋京华), Bao-Gen Shen(沈保根), Ji-Rong Sun(孙继荣)   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2018-11-27 修回日期:2018-12-25 出版日期:2019-03-05 发布日期:2019-03-05
  • 通讯作者: Ji-Rong Sun E-mail:jrsun@iphy.ac.cn
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant Nos. 2016YFA0300701, 2017YFA0206300, and 2017YFA0303601) and the National Natural Science Foundation of China (Grant Nos. 11520101002, 51590880, and 11674378).

Antiferromagnetic interlayer coupling of (111)-oriented La0.67Sr0.33MnO3/SrRuO3 superlattices

Hui Zhang(张慧)1,2, Jing Zhang(张静)1,2, Jin-E Zhang(张金娥)1,2, Fu-Rong Han(韩福荣)1,2, Hai-Lin Huang(黄海林)1,2, Jing-Hua Song(宋京华)1,2, Bao-Gen Shen(沈保根)1,2, Ji-Rong Sun(孙继荣)1,2   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-11-27 Revised:2018-12-25 Online:2019-03-05 Published:2019-03-05
  • Contact: Ji-Rong Sun E-mail:jrsun@iphy.ac.cn
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant Nos. 2016YFA0300701, 2017YFA0206300, and 2017YFA0303601) and the National Natural Science Foundation of China (Grant Nos. 11520101002, 51590880, and 11674378).

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摘要：

We report a strong antiferromagnetic (AFM) interlayer coupling in ferromagnetic La0.67Sr0.33MnO3/SrRuO3 (LSMO/SRO) superlattices grown on (111)-oriented SrTiO3 substrate. Unlike the (001) superlattices for which the spin alignment between LSMO and SRO is antiparallel in the in-plane direction and parallel in the out-of-plane direction, the antiparallel alignment is observed along both the in-plane and out-of-plane directions in the present sample. The low temperature hysteresis loop demonstrates two-step magnetic processes, indicating the coexistence of magnetically soft and hard components. Moreover, an inverted hysteresis loop was observed. Exchange bias tuned by the temperature and cooling field was also investigated, and positive as well as negative exchange bias was observed at the same temperature with the variation of the cooling field. A very large exchange field (HEB) was observed and both magnitude and sign of the HEB depend on the cooling field, which can be attributed to an interplay of Zeeman energy and AFM coupling energy at the interfaces. The present work shows the great potential of tuning a spin texture through interfacial engineering for the complex oxides whose spin state is jointly determined by strongly competing mechanisms.

关键词: transition metal oxide, interlayer coupling, exchange bias

Abstract:

We report a strong antiferromagnetic (AFM) interlayer coupling in ferromagnetic La0.67Sr0.33MnO3/SrRuO3 (LSMO/SRO) superlattices grown on (111)-oriented SrTiO3 substrate. Unlike the (001) superlattices for which the spin alignment between LSMO and SRO is antiparallel in the in-plane direction and parallel in the out-of-plane direction, the antiparallel alignment is observed along both the in-plane and out-of-plane directions in the present sample. The low temperature hysteresis loop demonstrates two-step magnetic processes, indicating the coexistence of magnetically soft and hard components. Moreover, an inverted hysteresis loop was observed. Exchange bias tuned by the temperature and cooling field was also investigated, and positive as well as negative exchange bias was observed at the same temperature with the variation of the cooling field. A very large exchange field (HEB) was observed and both magnitude and sign of the HEB depend on the cooling field, which can be attributed to an interplay of Zeeman energy and AFM coupling energy at the interfaces. The present work shows the great potential of tuning a spin texture through interfacial engineering for the complex oxides whose spin state is jointly determined by strongly competing mechanisms.

Key words: transition metal oxide, interlayer coupling, exchange bias

中图分类号:  (Magnetic oxides)

  • 75.47.Lx
75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures)) 75.25.-j (Spin arrangements in magnetically ordered materials (including neutron And spin-polarized electron studies, synchrotron-source x-ray scattering, etc.))