Anomalous Nernst and Hall effects in magnetized platinum and palladium

作者：Guo G Y^*; Niu Q; Nagaosa N

来源：Physical Review B, 2014, 89(21): 214406.

DOI：10.1103/PhysRevB.89.214406

We study the anomalous Nernst effect (ANE) and anomalous Hall effect (AHE) in proximity-induced ferromagnetic palladium and platinum which is widely used in spintronics, within the Berry phase formalism based on the relativistic band-structure calculations. We find that both the anomalous Hall (sigma(A)(xy)) and Nernst (alpha(A)(xy)) conductivities can be related to the spin Hall conductivity (sigma(S)(xy)) and band exchange splitting (Lambda(ex)) by relations sigma(A)(xy) = Delta(ex)e/(h) over bar sigma(S)(xy)(E-F)' and alpha(A)(xy) = -pi(2)/3 k(B)(2)T Delta(ex)/(h) over bar sigma(s)(xy)(mu)'', respectively. In particular, these relations would predict that the sigma(A)(xy) in themagnetized Pt (Pd) would be positive (negative) since the sigma(S)(xy) (E-F)' is positive (negative). Furthermore, both sigma(A)(xy) and alpha(A)(xy) are approximately proportional to the induced spin magnetic moment (m(s)) because the Delta(ex) is a linear function of m(s). Using the reported m(s) in the magnetized Pt and Pd, we predict that the intrinsic anomalous Nernst conductivity (ANC) in the magnetic platinum and palladium would be gigantic, being up to ten times larger than, e. g., iron, while the intrinsic anomalous Hall conductivity (AHC) would also be significant.

• 出版日期2014-6-9
• 单位北京大学