Title :
Enhancement of tunneling magnetoresistance through a magnetic barrier of granular Fe-Pb-O system
Author :
Hsu, Jen-Hwa ; Chang, Ching-Ray ; Huang, Yi-Hong
Author_Institution :
Dept. of Phys., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
9/1/2000 12:00:00 AM
Abstract :
A large value of magnetoresistance ratio has been observed in granular Fe-Pb-O solids. The large MR value is associated with the appearance of magnetic Pb ferrite encapsulated on the surface of iron granules. Spin-dependent tunneling picture can qualitatively describe the enhancement of magnetoresistance ratio. Calculated results based on the spin filter effect of the Pb-ferrite layer are reasonably in agreement with the experimental data of TMR enhancement in Fe-Pb-O solids
Keywords :
electron spin polarisation; ferrites; granular materials; iron compounds; lead compounds; magnetic thin films; magnetoresistance; tunnelling; Fe-Pb-O; granular Fe-Pb-O system; magnetic Pb ferrite; magnetic barrier; magnetoresistance ratio; spin filter effect; spin-dependent tunneling; tunneling magnetoresistance; Electrons; Ferrite films; Insulation; Iron; Magnetic films; Magnetic separation; Magnetic tunneling; Optical polarization; Solids; Tunneling magnetoresistance;
Journal_Title :
Magnetics, IEEE Transactions on
