Angular momentum and energy transferred through ferromagnetic resonance

Jander, Albrecht; Moreland, John; Kabos, Pavel
April 2001
Applied Physics Letters;4/16/2001, Vol. 78 Issue 16, p2348
Academic Journal
We show that ferromagnetic resonance (FMR) selectively transfers angular momentum and energy from a microwave field to the lattice as measurable torque and heat. The expected torque and absorbed power are derived classically in terms of Landau-Lifshitz dynamics, including demagnetizing field effects. The torque is also described as a photon absorption process, in which the absorbed photons carry both energy and angular momentum. FMR data are shown for a thin NiFe film deposited on a micromechanical cantilever detector that measures both torque and heat under nearly identical conditions. © 2001 American Institute of Physics.


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