title: Seebeck rectification enabled by intrinsic thermoelectrical coupling in magnetic tunneling junctions.
abstract: An intrinsic thermoelectric coupling effect in the linear response regime of magnetic tunneling junctions (MTJ) is reported. In the dc response, it leads to a nonlinear correction to Ohm's law. Dynamically, it enables a novel Seebeck rectification and second harmonic generation, which apply for a broad frequency range and can be magnetically controlled. A phenomenological model on the footing of the Onsager reciprocal relation and the principle of energy conservation explains very well the experimental results obtained from both dc and frequency-dependent transport measurements performed up to GHz frequencies. Our work refines previous understanding of magnetotransport and microwave rectification in MTJs. It forms a new foundation for utilizing spin caloritronics in high-frequency applications.
authors.affiliation: Department of Physics and Astronomy, University of Manitoba, Winnipeg, Canada R3T 2N2.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhang
authors.forename: Y S
authors.initials: YS
authors.lastname: Gui
authors.forename: L
authors.initials: L
authors.lastname: Fu
authors.forename: X L
authors.initials: XL
authors.lastname: Fan
authors.forename: J W
authors.initials: JW
authors.lastname: Cao
authors.forename: D S
authors.initials: DS
authors.lastname: Xue
authors.forename: P P
authors.initials: PP
authors.lastname: Freitas
authors.forename: D
authors.initials: D
authors.lastname: Houssameddine
authors.forename: S
authors.initials: S
authors.lastname: Hemour
authors.forename: K
authors.initials: K
authors.lastname: Wu
authors.forename: C-M
authors.initials: CM
authors.lastname: Hu