Interplay of magnon and electron currents in magnetic heterostructure
AffiliationUniv Arizona, Dept Phys
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationInterplay of magnon and electron currents in magnetic heterostructure 2017, 96 (2) Physical Review B
JournalPhysical Review B
Rights©2017 American Physical Society
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractIn magnetic materials, both electrons and magnons are capable of carrying angular momentum currents. An external electric field can efficiently drive a charge and spin current of electrons, but it is unable to directly produce a chargeless magnon current. The generation of the magnon current is conventionally achieved via thermal gradients or the electron spin injection from interfaces. Here, we investigate the magnon current induced by the momentum and angular momentum transfer from conduction electrons in magnetic layered systems. By using the generic exchange interaction between electrons andmagnons, we derive the coupled diffusion equations for electron spins and magnons and we find (a) the ratio between the magnon current and the electric charge current is substantial at room temperature for conventional conducting ferromagnets, (b) the spin diffusion length of electrons is significantly modified by the presence of the nonequilibrium magnon density, and (c) the giant magnetoresistance of the magnetic multilayers for the current perpendicular to the plane of layers is reduced compared to the prior theory without taking into account the magnon current.
VersionFinal published version
SponsorsNational Science Foundation [ECCS-1708180]