CHANGE IN CONDUCTANCE IS THE FUNDAMENTAL MEASURE OF SPIN-VALVE MAGNETORESISTANCE

被引:18
作者
DIENY, B [1 ]
NOZIERES, JP [1 ]
SPERIOSU, VS [1 ]
GURNEY, BA [1 ]
WILHOIT, DR [1 ]
机构
[1] IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120
关键词
D O I
10.1063/1.108322
中图分类号
O59 [应用物理学];
学科分类号
摘要
The absolute change of sheet conductance (DELTAG) of spin-valve multilayers is shown analytically and experimentally to be the macroscopic observable most directly related to the physical mechanism of giant magnetoresistance. Unlike the changes in resistance DELTAR/R or DELTAR, DELTAG is directly connected to the changes in the Fermi spheres of the ferromagnetic layers induced by the variation in magnetic alignment. In structures comprising Si/Co 80 angstrom/Cu 25 angstrom/NiFe 50 angstrom/FeMn 90 angstrom/Ta 50 angstrom/Cu t(Cu)/Ta 50 angstrom, in which only the thickness t(Cu) is varied, the values and the thermal variations of DELTAR/R(T) and DELTAR(T) are strongly influenced by t(Cu) through its shunting effect. In contrast DELTAG is found to be independent of shunting.
引用
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页码:2111 / 2113
页数:3
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