https://scholars.lib.ntu.edu.tw/handle/123456789/573448
標題: | Picosecond Creation of Switchable Optomagnets from a Polar Antiferromagnet with Giant Photoinduced Kerr Rotations | 作者: | Sheu Y.M., Chang Y.M., Chang C.P., Li Y.H., Babu K.R., Guo G.Y., Kurumaji T., Tokura Y. GUANG-YU GUO |
關鍵字: | Antiferromagnetic materials; Antiferromagnetism; Economic and social effects; Magnetic fields; Magnetization; Spin polarization; Antiferromagnetic state; Antiferromagnetics; Circularly polarized laser pulse; Ferrimagnetic state; Inversion symmetry; Saturated magnetization; Spin flip transitions; Strong magnetic fields; Crystal symmetry | 公開日期: | 2019 | 卷: | 9 | 期: | 3 | 來源出版物: | Physical Review X | 摘要: | On-demand spin orientation with a long polarized lifetime and an easily detectable signal is the ultimate goal for spintronics. However, there still exists a trade-off between controllability and stability of spin polarization, awaiting a significant breakthrough. Here, we demonstrate switchable optomagnet effects in (Fe1-xZnx)2Mo3O8, from which we can obtain tunable magnetization (spanning from-40% to 40% of a saturated magnetization) that is created from zero magnetization in the antiferromagnetic state without magnetic fields. It is accomplishable by utilizing circularly polarized laser pulses to excite spin-flip transitions in polar antiferromagnets that have no spin canting, traditionally hard to control without very strong magnetic fields. The spin controllability in (Fe1-xZnx)2Mo3O8 originates from its polar structure that breaks the crystal inversion symmetry, allowing distinct on-site d-d transitions for selective spin flip. By chemical doping, we exploit the phase competition between antiferromagnetic and ferrimagnetic states to enhance and stabilize the optomagnet effects, which result in long-lived photoinduced Kerr rotations. The present study creating switchable giant optomagnet effects in polar antiferromagnets sketches a new blueprint for the function of antiferromagnetic spintronics. ? 2019 authors. Published by the American Physical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074328584&doi=10.1103%2fPhysRevX.9.031038&partnerID=40&md5=886617eafdb2e22012f06e1938b8a670 https://scholars.lib.ntu.edu.tw/handle/123456789/573448 |
ISSN: | 21603308 | DOI: | 10.1103/PhysRevX.9.031038 | SDG/關鍵字: | Antiferromagnetic materials; Antiferromagnetism; Economic and social effects; Magnetic fields; Magnetization; Spin polarization; Antiferromagnetic state; Antiferromagnetics; Circularly polarized laser pulse; Ferrimagnetic state; Inversion symmetry; Saturated magnetization; Spin flip transitions; Strong magnetic fields; Crystal symmetry |
顯示於: | 物理學系 |
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