Substantial enhancement of thermal spin polarization in Py/Cu interface

Hu, Shaojie1,2; Zhao, Jingyan3,4; Wang, Lei1; Cui, Xiaomin5; Ohnishi, Kohei2,6; Ariki, Taisei6; Min, Tai1; Xia, Ke7; Kimura, Takashi2,6

2018-10-09

10.1103/PhysRevMaterials.2.104403

Physical Review Materials   影响因子和分区

2475-9953

We investigated the temperature dependence of thermally excited spin current properties of ferromagnet Py (Ni80Fe20) by using a lateral spin-valve structure. The spin-dependent Seebeck coefficient at the Py/Cu interface was found to show a significant increase at low temperature while the charge Seebeck coefficient showed the ordinal reduction with decreasing temperature. This produces a crossover between the charge-and spin-dependent Seebeck coefficients, resulting in the thermal spin polarization greater than 100% below 125 K. From the first-principles calculation specially developed for the Py/Cu interfaces, the spin-dependent Seebeck coefficient is found to be highly susceptible to the magnetic disorder-induced scattering at the interface. The calculation with considering the temperature dependence of the magnetic disorder provides a consistent description for the significant enhancement of spin-dependent Seebeck coefficient in the Py/Cu interface. Our demonstration shows the importance of interface disorder and paves the way toward the development of conventional ferromagnetic metal for the practical application of thermo-spin energy conversion.

SCI ; EI

英语

通讯

[18H03866]

Materials Science

Materials Science, Multidisciplinary

WOS:000446915900004

AMER PHYSICAL SOC

20191306695002

Binary alloys ; Calculations ; Energy conversion ; Ferromagnetic materials ; Ferromagnetism ; Iron alloys ; Seebeck coefficient ; Temperature distribution

Energy Conversion Issues:525.5 ; Iron Alloys:545.2 ; Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Magnetic Materials:708.4 ; Mathematics:921 ; High Energy Physics:932.1

Web of Science

1.Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Ctr Spintron & Quantum Syst, Xian 710049, Shaanxi, Peoples R China
2.Kyushu Univ, Res Ctr Quantum Nanospin Sci, 744 Motooka, Fukuoka, Fukuoka 8128581, Japan
3.Beijing Normal Univ, Ctr Adv Quantum Studies, Beijing 100875, Peoples R China
4.Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
5.Northwestern Polytech Univ, Sch Sci, Shaanxi Key Lab Condensed Matter Struct & Propert, Xian 710072, Peoples R China
6.Kyushu Univ, Dept Phys, 744 Motooka, Fukuoka, Fukuoka 8128581, Japan
7.Southern Univ Sci & Technol SUSTech, Dept Phys, SIQSE, Xueyuan Ave 1088, Shenzhen, Peoples R China

Hu, Shaojie,Zhao, Jingyan,Wang, Lei,et al. Substantial enhancement of thermal spin polarization in Py/Cu interface[J]. Physical Review Materials,2018,2(10).

Hu, Shaojie.,Zhao, Jingyan.,Wang, Lei.,Cui, Xiaomin.,Ohnishi, Kohei.,...&Kimura, Takashi.(2018).Substantial enhancement of thermal spin polarization in Py/Cu interface.Physical Review Materials,2(10).

Hu, Shaojie,et al."Substantial enhancement of thermal spin polarization in Py/Cu interface".Physical Review Materials 2.10(2018).