TY - JOUR
T1 - Magnon instability driven by heat current in magnetic bilayers
AU - Ohnuma, Yuichi
AU - Adachi, Hiroto
AU - Saitoh, Eiji
AU - Maekawa, Sadamichi
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/12/2
Y1 - 2015/12/2
N2 - We theoretically demonstrate that, in a ferromagnet/paramagnet bilayer, a magnon instability accompanied by a gigahertz microwave emission can be driven simply by means of a temperature bias. Employing many-body theory for investigating the effects of a phonon heat current on the magnon lifetime, we show that the magnon instability occurs upon the suppression of the umklapp scattering at low temperatures, leading to microwave emission. The present finding provides crucial information about the interplay of spin current and heat current.
AB - We theoretically demonstrate that, in a ferromagnet/paramagnet bilayer, a magnon instability accompanied by a gigahertz microwave emission can be driven simply by means of a temperature bias. Employing many-body theory for investigating the effects of a phonon heat current on the magnon lifetime, we show that the magnon instability occurs upon the suppression of the umklapp scattering at low temperatures, leading to microwave emission. The present finding provides crucial information about the interplay of spin current and heat current.
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U2 - 10.1103/PhysRevB.92.224404
DO - 10.1103/PhysRevB.92.224404
M3 - Article
AN - SCOPUS:84950341862
SN - 1098-0121
VL - 92
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 22
M1 - 224404
ER -