Magnetic anisotropy and crystal structure of intermetallic compounds of the ThMn/sub 12/ structure

Journal Article · Mon Nov 14 23:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.342437· OSTI ID:6749972

Solzi, M; Pareti, L; Moze, O; David, W I.F.

Intermetallic compounds of the type RE(TM/sub 1-//sub x/M/sub x/)/sub 12/ with RE = Y, Er; TM = Fe, Co; M = Si, Ti, V of the ThMn/sub 12/ tetragonal crystal structure have been studied by the singular point detection technique and high-resolution neutron powder diffraction in order to (a) evaluate both the rare-earth and transition-metal sublattice contributions to the magnetocrystalline anisotropy, (b) compare the Fe and Co anisotropies in the ThMn/sub 12/ structure, and (c) to verify the existence of any preferential entrance in the transition metal sublattice for various stabilizing ions. The transition metal anisotropy is of the same type (Fe axial, Co planar) and magnitude as in RE/sub 2/Fe/sub 14/B compounds. However, there is no anomalous temperature behavior of the anisotropy field H/sub a/. With decreasing temperature, the value of H/sub a/ increases from 21 kOe at 293 K to 37 kOe at 78 K in YFe/sub 11/Ti. Similar values are obtained for other Fe-based compounds. The contribution of Er to the anisotropy is found to be surprisingly low. The anisotropy field of ErFe/sub 11/Ti varies from 24 kOe at 293 K to 63 kOe at 100 K. The observed low values of the Curie temperatures in these compounds appears once again to limit their use in possible applications. Neutron powder diffraction shows that the 8j and 8f sites of the ThMn/sub 12/ structure are virtually fully occupied by Fe, while the 8i site is partially occupied by Fe and V in YFe/sub 10/V/sub 2/.

• Research Organization: Istituto Maspec del C.N.R., via Chiavari 18/a, 43100 Parma, Italy
• OSTI ID: 6749972
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 64:10; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTINIDE COMPOUNDS
ALLOYS
COBALT COMPOUNDS
CRYSTAL STRUCTURE
ERBIUM COMPOUNDS
INTERMETALLIC COMPOUNDS
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MANGANESE COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SILICON COMPOUNDS
THORIUM COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
YTTRIUM COMPOUNDS