title: Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films.
abstract: The Gilbert damping of ferromagnetic materials is arguably the most important but least understood phenomenological parameter that dictates real-time magnetization dynamics. Understanding the physical origin of the Gilbert damping is highly relevant to developing future fast switching spintronics devices such as magnetic sensors and magnetic random access memory. Here, we report an experimental study of temperature-dependent Gilbert damping in permalloy (Py) thin films of varying thicknesses by ferromagnetic resonance. From the thickness dependence, two independent contributions to the Gilbert damping are identified, namely bulk damping and surface damping. Of particular interest, bulk damping decreases monotonically as the temperature decreases, while surface damping shows an enhancement peak at the temperature of ~50 K. These results provide an important insight to the physical origin of the Gilbert damping in ultrathin magnetic films.
authors.affiliation: International Center for Quantum Materials, Peking University, Beijing, 100871, P. R. China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.
authors.forename: Yuelei
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: International Center for Quantum Materials, Peking University, Beijing, 100871, P. R. China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Song
authors.affiliation: IBM Almaden Research Center, San Jose, California 95120, USA.
authors.forename: See-Hun
authors.initials: SH
authors.lastname: Yang
authors.affiliation: International Center for Quantum Materials, Peking University, Beijing, 100871, P. R. China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.
authors.forename: Tang
authors.initials: T
authors.lastname: Su
authors.affiliation: International Center for Quantum Materials, Peking University, Beijing, 100871, P. R. China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yuan
authors.affiliation: IBM Almaden Research Center, San Jose, California 95120, USA.|Max Planck Institute for Microstructure Physics, 06120 Halle (Saale), Germany.
authors.forename: Stuart S P
authors.initials: SSP
authors.lastname: Parkin
authors.affiliation: Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.
authors.forename: Jing
authors.initials: J
authors.lastname: Shi
authors.affiliation: International Center for Quantum Materials, Peking University, Beijing, 100871, P. R. China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Han