Magnetic properties of single crystals of GdCo$sub 2$, HoNi$sub 2$, and HoCo$sub 2$

Journal Article · Sat Nov 01 04:00:00 EST 1975 · Phys. Rev., B, v. 12, no. 9, pp. 3878-3884

OSTI ID:4102809

Gignoux, D; Givord, F; Lemaire, R

Magnetic measurements performed on single crystals of the GdCo$sub 2$, HoNi$sub 2$, and HoCo$sub 2$ Laves phases lead to a quantitative analysis of the crystal-field effects on energy and magnetization anisotropies. The anisotropy due to cobalt is negligible. Crystal-field parameters were determined from the magnetization variation in intense magnetic fields. The change of easy magnetization direction observed at 14$sup 0$K on HoCo$sub 2$ corresponds to a change, with temperature, of the level scheme of the $sup 5$$J$$sub 8$ ground-state multiplet. An entropy discontinuity is associated with this transition, leading to a specific-heat anomaly. For HoCo$sub 2$, the values of the anisotropy constants at 0$sup 0$K are K$sub 1$ = -10$sup 7$ g/cm$sup 3$ and K$sub 2$ = 10$sup 9$ erg/cm$sup 3$. Interactions in HoNi$sub 2$ are weak compared to crystal-field effects; when a magnetic field is applied, the anisotropy increases so much that it is no longer possible to measure it. (auth)

• Research Organization: CNRS, Grenoble, France
• NSA Number: NSA-33-017799
• OSTI ID: 4102809
• Journal Information: Phys. Rev., B, v. 12, no. 9, pp. 3878-3884, Journal Name: Phys. Rev., B, v. 12, no. 9, pp. 3878-3884; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

*COBALT ALLOYS-- MAGNETIZATION
*GADOLINIUM ALLOYS-- MAGNETIZATION
*HOLMIUM ALLOYS-- MAGNETIZATION
*NICKEL ALLOYS-- MAGNETIZATION
360104* --Materials--Metals & Alloys--Physical Properties
ANISOTROPY
CRYSTAL FIELD
INTERMETALLIC COMPOUNDS
LAVES PHASES
MONOCRYSTALS
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE