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

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

909

Lastpage

911

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706308

Filename

706308