Title :
Mossbauer studies of Fe-Pb-O granular films with enhanced tunneling magnetoresistance effect
Author :
Hsu, Jen-Hwa ; Huang, Y.H. ; Tseng, P.K. ; Chen, D.E.
Author_Institution :
Dept. of Phys., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
7/1/1998 12:00:00 AM
Abstract :
From our previous studies, it has been found that the Fe-Pb-O granular films which have been adequately annealed exhibit an enhanced tunneling magnetoresistance effect (TMR). The TMR effect is about 10% at room temperature, which can be claimed as the maximum value over detected so far. In this report the TMR effect of Fe-Pb-O granular films from different annealing time have been investigated. The Mossbauer spectrometer was used to collect the information of Fe magnetic microstructure. It has been found that the tunneling barrier from the magnetic compound formed between α-Fe2O3 and PbO plays an important role in obtaining large TMR effect. And the non-magnetic Fe-Pb-O compounds which exist on the surface of iron granules as a thin layer and grow with annealing time seem to decrease TMR effect
Keywords :
Mossbauer effect; annealing; discontinuous metallic thin films; iron compounds; lead compounds; magnetoresistance; tunnelling; Fe magnetic microstructure; Fe-Pb-O; Fe-Pb-O granular films; Mossbauer spectra; enhanced tunneling magnetoresistance effect; Annealing; Iron; Magnetic films; Micromagnetics; Physics; Saturation magnetization; Spectroscopy; Sputtering; Temperature; Tunneling magnetoresistance;
Journal_Title :
Magnetics, IEEE Transactions on
