Title :
Spin-Polarized Transport Phenomena in Double Magnetic Tunnel Junctions Caused by Ferromagnetic CoFe Nanoparticles
Author :
Yoon, Kapsoo ; Kim, Kiwoong ; Koo, Jahyun ; Yang, Jungyup ; Do, YoungHo ; Kwak, Junesik ; Hong, Jinpyo
Author_Institution :
Dept. of Phys., Hanyang Univ., Seoul, South Korea
Abstract :
We present some unusual spin-polarized transport phenomena in asymmetric double barrier magnetic tunneling junctions (ADBMTJs) with CoFe/AlOx/ferromagnetic nanoparticle (FM-NPs)/AlOx/Ta structures. The conductance curves and the magnetoresistance ratio clearly oscillate with applied bias voltage, indicating the presence of Coulomb blockade effects due to isolated ferromagnetic nanoparticles in the parallel configuration in the ADBMTJ. The oscillation period is about 1.5 mV at 2 K.
Keywords :
Coulomb blockade; aluminium compounds; cobalt alloys; ferromagnetic materials; iron alloys; magnetic particles; magnetic tunnelling; magnetoresistance; spin polarised transport; tantalum; CoFe-AlOx-Ta; Coulomb blockade; asymmetric double magnetic tunnel junctions; conductance curve; ferromagnetic nanoparticles; magnetoresistance ratio; spin polarized transport; temperature 2 K; Electrons; Magnetic materials; Magnetic properties; Magnetic tunneling; Magnetoresistance; Nanoparticles; Quantum capacitance; Spin polarized transport; Temperature; Voltage; Double magnetic tunnel junctions; magnetic devices;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2027995
