Martin Buchner, K. Lenz, Verena Ney, J. Lindner, Andreas Ney,
"Spin pumping into a partially compensated antiferromagnetic/paramagnetic insulator"
, in New Journal of Physics, Vol. 25, Seite(n) 0730021-11, 2023
Original Titel:
Spin pumping into a partially compensated antiferromagnetic/paramagnetic insulator
Sprache des Titels:
Englisch
Original Kurzfassung:
Spin pumping from a metallic ferromagnet (FM) into an insulating antiferromagnet has been
studied across the magnetic phase transition by means of temperature-dependent, broad-band
ferromagnetic resonance (FMR) experiments. A set of spin pumping heterostructures consisting of
Permalloy (Ni80Fe20) as FM and Zn1?xCoxO with x = 0.3, 0.5 and 0.6 (Co:ZnO) as partially
compensated antiferromagnetic insulator has been used for which previous experiments have
already pointed out the possibility of the existence of spin-pumping. The present experiments
allow to reliably separate the various contributions of the temperature-dependent Gilbert damping
parameter to the FMR line-width. A careful analysis of the obtained data demonstrates a significant
increase of the temperature-dependence of the Gilbert damping parameter ?(T) around the
magnetic phase transition of Co:ZnO which extends up to room temperature, confirming spin
pumping into the fluctuating spin sink of an antiferromagnetic/paramagnetic insulator.