title: Thermal imaging of spin Peltier effect.
abstract: The Peltier effect modulates the temperature of a junction comprising two different conductors in response to charge currents across the junction, which is used in solid-state heat pumps and temperature controllers in electronics. Recently, in spintronics, a spin counterpart of the Peltier effect was observed. The 'spin Peltier effect' modulates the temperature of a magnetic junction in response to spin currents. Here we report thermal imaging of the spin Peltier effect; using active thermography technique, we visualize the temperature modulation induced by spin currents injected into a magnetic insulator from an adjacent metal. The thermal images reveal characteristic distribution of spin-current-induced heat sources, resulting in the temperature change confined only in the vicinity of the metal/insulator interface. This finding allows us to estimate the actual magnitude of the temperature modulation induced by the spin Peltier effect, which is more than one order of magnitude greater than previously believed.
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.|WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Daimon
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Iguchi
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Tomosato
authors.initials: T
authors.lastname: Hioki
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.|WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.|Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan.|Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Sendai 980-8577, Japan.|Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Saitoh
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.|Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan.|PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan.
authors.forename: Ken-Ichi
authors.initials: KI
authors.lastname: Uchida