Change in resistance of CuFe wires induced by spin injection

Author

Taniyarna, T. ; Fujiwara, N. ; Kitamoto, Y. ; Yamazaki, Y.

Author_Institution

Cavendish Lab., Cambridge Univ., UK

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2872

Lastpage

2874

Abstract

Spin injection from a ferromagnetic metal Co into a Kondo alloy CuFe is demonstrated using the devices with a Co/CuFe wire junction. The temperature dependent resistivity of CuFe shows an increase below 20 K as spin current flows from CuFe into Co as seen in Kondo alloys. In contrast, the resistivity for the opposite current direction from Co into CuFe decreases at low temperatures at a current of 250 μA. The difference between the resistivities of both the current directions logarithmically increases with decreasing temperature, indicating the suppression of the spin scattering at Fe impurities that causes the logarithmic increase in Kondo alloys.

Keywords

Kondo effect; copper alloys; dilute alloys; dilute magnetic materials; ferromagnetic-paramagnetic transitions; iron alloys; magnetisation reversal; magnetoresistance; spin disorder resistivity; Co-CuFe; CuFe; Kondo alloy; diluted magnetic alloys; ferromagnetic metal; higher order corrections; internal field; logarithmic increase; magnetoresistance; nonequilibrium magnetization; paramagnetic metal; spin accumulation; spin current; spin diffusion length; spin injection; spin scattering at impurities; temperature dependent resistivity; wire junction; Cobalt alloys; Conductivity; Impurities; Iron alloys; Magnetization; Ocean temperature; Scattering; Spin polarized transport; Temperature dependence; Wires;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.803135

Filename

1042393