Journal
IEEE TRANSACTIONS ON PLASMA SCIENCE
Volume 49, Issue 11, Pages 3344-3350Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2021.3112456
Keywords
Magnetic domains; Radiation effects; Plasma temperature; Magnetization; Magnetic resonance imaging; Free electron lasers; Optical pulses; Free-electron laser (FEL); magnetic domain; spintronics; terahertz wave
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP20H02206, JP20K22478, JP21K14550]
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The control of magnetic domain in ErFeO3 single crystal, a weak ferromagnet, is demonstrated using high-intensity terahertz (THz) pulse excitation. The THz pulses induce magnetic domain inversion by causing a combination of depinning of the magnetic domain due to local heating and the entropic force owing to the thermal gradient. The experiments were conducted at room temperature and around the spin reorientation phase transition.
The control of magnetic domain in correlated spin systems by optical pulses has been gaining importance in spintronics and related fields. In particular, ultrafast control of magnetic domain is one of the top areas of interest. Herein we demonstrate the magnetic domain control in ErFeO3 single crystal, a weak ferromagnet, induced by high-intensity terahertz (THz) pulse excitation from a free-electron laser. THz pulses with a central frequency of 4 THz and pulse energy in the order of 10 mJ were used. The microscopic images of the magnetic domain inversion induced by the THz irradiation were recorded by the Faraday-rotation method using a He-Ne probe laser. The experimental results of the THz pulse irradiation at room temperature and at low temperature around the spin reorientation phase transition are presented. We show that the THz pulse excitation can expand the minor magnetic domain toward the direction of the THz beam spot. The magnetic domain inversion is caused by the combination of depinning of the magnetic domain due to local heating and the entropic force owing to the thermal gradient induced by THz irradiation.
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