Open AccessElectric and thermal spin transfer torques across ferromagnetic/normal/ferromagnetic graphene junctions
Author(s) -
Zhi Ping Niu,
Meng Wu
Publication year - 2020
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/abadb1
Subject(s) - condensed matter physics , ferromagnetism , physics , spintronics , graphene , electron , spin (aerodynamics) , spin transfer torque , thermal conduction , thermal , magnetization , magnetic field , quantum mechanics , thermodynamics , meteorology
We investigate the spin transfer torque (STT) driven by electric bias voltages across and temperature gradients through ferromagnetic/normal/ferromagnetic graphene junctions. Due to the unique band structure of the ferromagnetic graphene, there exists two transport regimes: the electron to electron (I) and hole to electron (II) transport. The electric STTs originated from the two regimes have opposite sign and can be reduced by the competition between the two transport processes. On the contrary, the thermal STTs originated from the transport regimes I and II have the same sign and are enhanced when the two regimes coexist. Remarkably, the thermal STT is comparable with the electric STT. Furthermore, the electric and thermal counterpart can be manipulated by the Fermi level. The controllable STT reported here makes the ferromagnetic graphene junction ideal for future spintronics applications.