| 研究課題/領域番号 |
21K13873
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分13030:磁性、超伝導および強相関系関連
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| 研究機関 | 国立研究開発法人理化学研究所 |
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研究代表者 |
ヌイェン カーン 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (50775608)
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| 研究期間 (年度) |
2021-04-01 – 2024-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
4,160千円 (直接経費: 3,200千円、間接経費: 960千円)
2022年度: 650千円 (直接経費: 500千円、間接経費: 150千円)
2021年度: 3,510千円 (直接経費: 2,700千円、間接経費: 810千円)
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| キーワード | Magnetism / Antiferromagnet / Symmetry Breaking / Nonreciprocal transport |
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| 研究開始時の研究の概要 |
Antiferromagnet appears as a promising candidate toward realizing denser, faster, and more robust future spin-electronic devices. We focus on develop a simple and efficient method using electric current to manipulate, “read and write”, antiferromagnetic states in a new class of material.
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| 研究実績の概要 |
Antiferromagnetic materials recently appear as a promising candidate toward realizing denser, faster, and more robust future spin-electronic devices, despite the difficulty to control. In this work, we aim to develop and investigate a new class of antiferromagnetic materials, transition metal intercalated van der Waals materials with non-coplanar spin texture. Utilizing the unique feature of simultaneous symmetry breaking in this material, we would like to pursuit 2 targets: (i) Non-reciprocal transport phenomena in chiral antiferromagnet with broken time-reversal symmetry and (ii) Manipulation of antiferromagnetic states with electric current. Successful observation of these phenomene may pave a new way toward establishing an effective method for reading out and writing AFM states.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
At the current stage, the large single crystal was succesfully grown and characterized the non-coplanar magnetic structure. The sample also exhibits large anomalous Hall effect accompanied with an odd-parity linear magnetoresistance (MR) arises from antiferromagnetic order with broken time reversal symmetry. The non-reciprocal MR and spontaneous Hall resistivity exhibit similar scaling behavior upon temperature variation and field cooling, which evidences the correlation between antiferromagnetic order. In order to observe higher order non-reciprocal transport property, we fabricated the micro-device using focused ion beam technique. By reduced the sample dimension and contact condition, we observed the electrical magnetochiral effect, as well as proceeded to the switching magnetic state using electric current.
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| 今後の研究の推進方策 |
As for the future plan, we are currently summarizing the results into manuscript. In addition, as for the purpose of switching magnetic state, reversal of AFM states via reading out the Hall resistivity has been achieved, the controllable / deterministic switching is highly desired because of the the random nucleation of magnetic domain due to heating generated via application of current pulse. To overcome this issue, improving the device configuration is required to reduce the impact of undesired heating. In addition, because this class of material allows to exfoliate into thin flake, investigation the evolution of magnetic property upon reducing sample dimention is also one of interesting issues for future study.
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