Samarium-iron based magnet materials with the Th sub 2 Zn sub 17 -type structure

Journal Article · Wed May 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347615· OSTI ID:5812675

Weitzer, F; Hiebl, K; Rogl, P ^[1]

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1. Institut fuer Physikalische Chemie der Universitaet Wien, A-1090 Wien, Waehringerstrasse 42, Austria (AT)

Substitution mode and magnetic behavior in Sm{sub 2}Fe{sub 17} have been investigated as a function of (a) the metal substitution (Fe replaced by Mn, Co, Al, Ga) and (b) the accommodation of interstitial carbon atoms. X-ray powder analysis proved in all cases a consistency with the rhombohedral Th{sub 2}Zn{sub 17}-type structure and with a random distribution of the Al-atoms on the iron-sublattice sites. Substitution of iron in Sm{sub 2}Fe{sub 17} by Mn,Co,Al,Ga, and/or carbon leads to an anisotropy change from easy plane to easy axis geometry. In correspondence with the volume expansion, Curie temperatures tend to increase as a result of an enhanced ferromagnetic coupling mechanism. Magnetization values, however, are strongly reduced due to a change of collinear ferrimagnetism to a ferromagnetic type of order of the various magnetic sublattices. The magnetic anisotropy phase diagram at 300 K has been derived for the iron-rich region of the quaternary system Sm{sub 2}Fe{sub 17{minus}{ital x}{minus}{ital y}}Co{sub {ital x}}Al{sub {ital y}} (0{le}{ital x}{le}8, 0{le}{ital y}{le}3) revealing a wide region of spin reorientation between the fields of easy plane and easy axis anisotropy.

• OSTI ID: 5812675
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
ANISOTROPY
COBALT ADDITIONS
COBALT ALLOYS
CRYSTAL STRUCTURE
CURIE POINT
GALLIUM ADDITIONS
GALLIUM ALLOYS
IRON ALLOYS
MAGNETIZATION
MANGANESE ADDITIONS
MANGANESE ALLOYS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SAMARIUM ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE