期刊
CERAMICS INTERNATIONAL
卷 44, 期 4, 页码 3760-3764出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.11.159
关键词
Spin-polarized transport; Magnetoresistance; Materials design; Current annealing
资金
- National Key R&D Program of China [2017YFB0702701]
- Fundamental Research Funds for the Central Universities [020414380073]
- National Natural Science Foundation of China [11604147]
- Scientific Research Foundation of Graduate School of Nanjing University
- Laboratory Research Project of Nanjing Tech University [2017XSY16]
Studies on spintronics have provided solid evidence that the grain boundaries (GBs) in polycrystalline manganite can produce a strong extrinsic magnetoresistance (MR). This type of MR, called Low-field MR (LFMR), is larger than the intrinsic MR and can be triggered over a wide range of temperature. However, the existence of more GBs would bring about the weakening of magnetism and decrease the magnitude of MR simultaneously. Here we show that during annealing the application of electric-current to a representative ferromagnetic manganite perovskite, polycrystalline La2/3Sr1/3MnO3 (LSMO), can produce more GBs and improve low-field magnetization, which leads to enhanced MR effect and field-response sensitivity as compared to the traditional-annealed sample. By using static micromagnetic models combined with the theories of spin-polarized intergrain tunneling and charge carrier hopping across domain wall, the observed enhancement of magnetoresistive response in current-annealed LSMO can be well explained.
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