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Your search keyword '"Ke, Ya-Jiao"' showing total 6 results
Start Over Author "Ke, Ya-Jiao" Journal chinese physics b
6 results on '"Ke, Ya-Jiao"'

2. Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO3 heterostructure Project supported by the National Key Research Program of China (Grant Nos. 2018YFF01010303, 2017YFB0702702, and 2016YFA0300701), the National Natural Sciences Foundation of China (Grant Nos. 52031015, 1187411, 51427801, and 51871235), and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant Nos. QYZDJ-SSW-JSC023, KJZD-SW-M01, and ZDYZ2012-2)

Author

Li, Na, 李, 娜, Tang, Jin, 汤, čż›, Su, Lei, č‹Ź, 磊, Ke, Ya-Jiao, 柯亚, 娇, Zhang, Wei, ĺĽ, 伟, Xie, Zong-Kai, 谢宗, 凯, Sun, Rui, ĺ-™, ç'ž, Zhang, Xiang-Qun, ĺĽ, ĺ'群, He, Wei, 何, 为, Cheng, Zhao-Hua, and 成, ć˜-华

Subjects
NUCLEAR spin, NEUTRON diffraction, LASER pumping, PHONONS, ANTIFERROMAGNETIC materials, FERROMAGNETIC materials
Abstract

We investigate the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure Fe/GdFeO3 via an all-optical method. After laser irradiation, the terahertz spin precession is hard to be excited in a bare GdFeO3 without spin reorientation phase but efficiently in Fe/GdFeO3. Both quasi-ferromagnetic and impurity modes, as well as a phonon mode, are observed. We attribute it to the optical modification of interfacial exchange coupling between Fe and GdFeO3. Moreover, the excitation efficiency of dynamics can be modified significantly via the pump laser influence. Our results elucidate that the interfacial exchange coupling is a feasible stimulation to efficiently excite terahertz spin dynamics in antiferromagnets. It will expand the exploration of terahertz spin dynamics for antiferromagnet-based opto-spintronic devices. [ABSTRACT FROM AUTHOR]

Published
2021
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5. Large reversible magnetocaloric effect in HoMn2O5.

Author

Ge Heng, Zhang Xiang-Qun, Ke Ya-Jiao, Jin Jin-Ling, Liao Zhi-Xin, and Cheng Zhao-Hua

Subjects
MAGNETOCALORIC effects, MAGNETIZATION, MAGNETIC entropy, MAGNETIC fields, TEMPERATURE, MAGNETOSTRICTION, REFRIGERANTS
Abstract

Magnetocaloric effect (MCE) in polycrystalline HoMn2O5 was investigated by isothermal magnetization curves from 2 K to 50 K. A relatively large magnetic entropy change, ΔSM = 7.8 J/(kg ·K), was achieved with the magnetic field up to 70 kOe (1 Oe = 79.5775 A · m-1). The magnetic entropy change is reversible in the whole range of temperature. The contributions of elastic and magnetoelastic energy to the changing of the magnetic entropy are discussed in terms of the Landau theory. The reversibility of MCE with maximal refrigerant capacity RC = 216.7 J/kg makes polycrystalline HoMn2O5 promising as a magnetic refrigerant. [ABSTRACT FROM AUTHOR]

Published
2013
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6. Large reversible magnetocaloric effect in HoMn2O5.

Author

Ge Heng, Zhang Xiang-Qun, Ke Ya-Jiao, Jin Jin-Ling, Liao Zhi-Xin, and Cheng Zhao-Hua

Subjects
*MAGNETOCALORIC effects, *MAGNETIZATION, *MAGNETIC entropy, *MAGNETIC fields, *TEMPERATURE, *MAGNETOSTRICTION, *REFRIGERANTS
Abstract

Magnetocaloric effect (MCE) in polycrystalline HoMn2O5 was investigated by isothermal magnetization curves from 2 K to 50 K. A relatively large magnetic entropy change, ΔSM = 7.8 J/(kg ·K), was achieved with the magnetic field up to 70 kOe (1 Oe = 79.5775 A · m-1). The magnetic entropy change is reversible in the whole range of temperature. The contributions of elastic and magnetoelastic energy to the changing of the magnetic entropy are discussed in terms of the Landau theory. The reversibility of MCE with maximal refrigerant capacity RC = 216.7 J/kg makes polycrystalline HoMn2O5 promising as a magnetic refrigerant. [ABSTRACT FROM AUTHOR]

Published
2013
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