Effects of magnetic and structural properties on magnetoresistance in amorphous TbFeCo

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345944· OSTI ID:7123569

Yumoto, S; Hidaka, Y; Okada, O ^[1]

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1. Functional Devices Research Labs, NEC Corporation, Kawasaki 213, Japan (JP)

An extraordinary magnetoresistance effect, linearly dependent on the external magnetic field, is observed in amorphous TbFeCo films. The electrical resistance jumps by {delta}{rho} at magnetization reversal. {delta}{rho} depends on Tb concentration and it becomes nearly zero at about Tb 26 at. % concentration. To clarify the Tb concentration dependence of {delta}{rho}, the magnetic properties and the heat treatment effect are examined. It is found that the magnetic anisotropy field ({ital H}{sub {ital k}}) is maximum at about Tb 26 at. % and the gradient of linear magnetoresistance, {delta}{rho}/({rho}{sub 0}{ital H}{sub {ital c}}), is proportional to the {minus}{ital H}{sub {ital k}}+ const, where {rho}{sub 0} is the electric resistance in zero field, {ital H}{sub {ital c}} is the coercive force, and the constant is about 100 kOe. The structural relaxation, a coercive force change by the heat treatment up to 200 {degree}C, is examined. It is found that as {delta}{rho}/({rho}{sub 0}{ital H}{sub {ital c}}) in the as-sputtered state decreases, the coercive force change by the heat treatment decreases. The coercive force change is minimum at about Tb 26 at. %, where {delta}{rho}/({rho}{sub 0}{ital H}{sub {ital c}}) becomes zero. These results mean that linear magnetoresistance is related to structure relaxation by heat treatment. The {delta}{rho} disappearance at about Tb 26 at. % is based on the stable structure against heat treatment and the largest magnetic anisotropy field.

• OSTI ID: 7123569
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
AMORPHOUS STATE
COBALT COMPOUNDS
COERCIVE FORCE
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HEAT TREATMENTS
IRON COMPOUNDS
MAGNETIZATION
MAGNETORESISTANCE
MICROSTRUCTURE
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
TERBIUM COMPOUNDS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS