Single-magnon tunneling through a ferromagnetic nanochain
N.N. Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine 14-b Metrologichna Str., Kiev 03680, Ukraine
Department of Physics, Polytechnic Institute of NYU, Brooklyn, New York 11201, USA
Received December 29, 2009
Magnon transmission between ferromagnetic contacts coupled by a linear ferromagnetic chain is studied at
the condition when the chain exhibits itself as a tunnel magnon transmitter. It is shown that dependently on magnon
energy at the chain, a distant intercontact magnon transmission occurs either in resonant or off-resonant
tunneling regime. In the first case, a transmission function depends weakly on the number of chain sites whereas
at off-resonant regime the same function manifests an exponential drop with the chain length. Change of direction
of external magnetic field in one of ferromagnetic contacts blocks a tunnel transmission of magnon.
PACS: 05.60.Gg Quantum transport; PACS: 85.75.–d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integratedmagnetic fields.