Current-dependent positive magnetoresistance in La0.8Ba0.2MnO3 ultrathin films*
文献类型：期刊论文
| 作者 | Lin, Guankai1; Wang, Haoru1; Cai, Xuhui1; Tong, Wei2 ; Zhu, Hong1,3
|
| 刊名 | CHINESE PHYSICS B
 |
| 出版日期 | 2021-09-01 |
| 卷号 | 30 |
| 关键词 | positive magnetoresistance electroresistance Joule self-heating conductive filament |
| ISSN号 | 1674-1056 |
| DOI | 10.1088/1674-1056/ac012d |
| 通讯作者 | Zhu, Hong(zhuh@ustc.edu.cn) |
| 英文摘要 | We report an investigation into the magnetoresistance (MR) of La0.8Ba0.2MnO3 ultrathin films with various thicknesses. While the 13 nm-thick film shows the commonly reported negative magnetoresistive effect, the 6 nm- and 4 nm-thick films display unconventional positive magnetoresistive (PMR) behavior under certain conditions. As well as the dependence on the film's thickness, it has been found that the electrical resistivity and the PMR effect of the thinner films are very dependent on the test current. For example, the magnetoresistive ratio of the 4 nm-thick film changes from +46% to -37% when the current is increased from 10 nA to 100 nA under 15 kOe at 40 K. In addition, the two thinner films present opposite changes in electrical resistivity with respect to the test current, i.e., the electroresistive (ER) effect, at low temperatures. We discuss the complex magnetoresistive and ER behaviors by taking account of the weak contacts at grain boundaries between ferromagnetic metallic (FMM) grains. The PMR effect can be attributed to the breaking of the weak contacts due to the giant magnetostriction of the FMM grains under a magnetic field. Considering the competing effects of the conductive filament and local Joule self-heating at grain boundaries on the transport properties, the dissimilar ER effects in the two thinner films are also understandable. These experimental findings provide an additional approach for tuning the magnetoresistive effect in manganite films. |
| WOS关键词 | ELECTRICAL-TRANSPORT ; ELECTRORESISTANCE ; MAGNETOSTRICTION ; MAGNETOTRANSPORT ; BEHAVIOR |
| 资助项目 | National Natural Science Foundation of China[11674298] ; National Key Research and Development Program of China[2017YFA0403502] ; Users with Excellence Project of Hefei Science Center CAS[2018HSC-UE013] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000692241200001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | National Natural Science Foundation of China ; National Key Research and Development Program of China ; Users with Excellence Project of Hefei Science Center CAS |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/125261]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Zhu, Hong |
| 作者单位 | 1.Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China 2.Chinese Acad Sci, High Magnet Field Lab, Anlitu Prov Key Lab Condensed Matter Phys Extreme, Hefei 230031, Peoples R China 3.Chinese Acad Sci, Key Lab Strongly Coupled Quantum Matter Phys, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lin, Guankai,Wang, Haoru,Cai, Xuhui,et al. Current-dependent positive magnetoresistance in La0.8Ba0.2MnO3 ultrathin films*[J]. CHINESE PHYSICS B,2021,30. |
| APA | Lin, Guankai,Wang, Haoru,Cai, Xuhui,Tong, Wei,&Zhu, Hong.(2021).Current-dependent positive magnetoresistance in La0.8Ba0.2MnO3 ultrathin films*.CHINESE PHYSICS B,30. |
| MLA | Lin, Guankai,et al."Current-dependent positive magnetoresistance in La0.8Ba0.2MnO3 ultrathin films*".CHINESE PHYSICS B 30(2021). |
入库方式： OAI收割
来源：合肥物质科学研究院
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