2008/06/24 by O. P. Balkashin, V. V. Fisun, I. K. Yanson +4
Physics and Astronomy · #Condensed matter physics #Conductance #Electron #Excitation #Ferromagnetic resonance #Ferromagnetism #Magnetic field #Magnetic properties of thin films #Magnetization #Magnetoresistance #Magnon #Materials science #Microwave #Physics #Quantum and electron transport phenomena #Semiconductor materials and interfaces #Spin (aerodynamics) #Spin Hall effect #Spin polarization #Spin wave #Spin-transfer torque #cond-mat.mtrl-sci #cond-mat.other
paper · pdf · doi:10.1103/physrevb.79.092419
arxiv created 2008/06/24 · openalex publication_date 2009/03/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Excitation of magnons or spin waves driven by nominally unpolarized transport currents in point contacts of normal and ferromagnetic metals is probed by irradiating the contacts with microwaves. Two characteristic dynamic effects are observed: a suppression of spin-wave nonlinearities in the point contact conductance by off-resonance microwave irradiation and a resonant stimulation of spin-wave peaks in the differential resistance of the nanocontacts by the microwave field. These observations provide direct evidence that the magnetoresistance peaks observed are due to gigahertz spin dynamics at the ferromagnetic interface driven by the spin transfer torque effect of the transport current.