Measuring the spin polarization of a metal with a superconducting point contact

被引：1608

作者：

Soulen, RJ

Byers, JM ^{[1
]}

Osofsky, MS

Nadgorny, B

Ambrose, T

Cheng, SF

Broussard, PR

Tanaka, CT

Nowak, J

Moodera, JS

Barry, A

Coey, JMD

机构：

[1] George Washington Univ, Dept Phys, Washington, DC 20052 USA

[2] USN, Res Lab, Washington, DC 20375 USA

[3] MIT, Francis Bitter Natl Magnet Lab, Cambridge, MA 02139 USA

[4] Univ Dublin Trinity Coll, Dept Phys, Dublin 2, Ireland

来源：

SCIENCE | 1998年 / 282卷 / 5386期

关键词：

D O I：

10.1126/science.282.5386.85

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals. Because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermi surface, the differential conductance of the point contact can reveal the spin polarization of the metal. This technique has been applied to a variety of metals where the spin polarization ranges from 35 to 90 percent: Ni0.8Fe0.2, Ni, Co, Fe, NiMnSb, La0.7Sr0.3MnO3, and CrO2.

引用

页码：85 / 88

页数：4

共 19 条

[1]

ANDREEV AF, 1964, SOV PHYS JETP-USSR, V19, P1228

[2] METALLIC TO TUNNELING TRANSITION IN CU-NB POINT CONTACTS [J].

BLONDER, GE ;

TINKHAM, M .

PHYSICAL REVIEW B, 1983, 27 (01) :112-118

[3] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[4] X-ray photoemission spectroscopy of La0.67Ca0.33MnO3 films [J].

Broussard, PR ;

Qadri, SB ;

Browning, VM ;

Cestone, VC .

APPLIED SURFACE SCIENCE, 1997, 115 (01) :80-86

[5] NEW CLASS OF MATERIALS - HALF-METALLIC FERROMAGNETS [J].

DEGROOT, RA ;

MUELLER, FM ;

VANENGEN, PG ;

BUSCHOW, KHJ .

PHYSICAL REVIEW LETTERS, 1983, 50 (25) :2024-2027

[6] ANDREEV REFLECTION IN FERROMAGNET-SUPERCONDUCTOR JUNCTIONS [J].

DEJONG, MJM ;

BEENAKKER, CWJ .

PHYSICAL REVIEW LETTERS, 1995, 74 (09) :1657-1660

[7]

Feder R., 1985, POLARIZED ELECT SURF

[8]

HARRIS VG, UNPUB

[9] CRO2 - A NEW HALF-METALLIC FERROMAGNET [J].

KAMPER, KP ;

SCHMITT, W ;

GUNTHERODT, G ;

GAMBINO, RJ ;

RUF, R .

PHYSICAL REVIEW LETTERS, 1987, 59 (24) :2788-2791

[10] Validity of the Julliere model of spin-dependent tunneling [J].

MacLaren, JM ;

Zhang, XG ;

Butler, WH .

PHYSICAL REVIEW B, 1997, 56 (18) :11827-11832

← 1 2 →