Anisotropic perpendicular axis magnetostriction in twinned Tb sub x Dy sub 1 minus x Fe sub 1. 95
- Naval Surface Warfare Center, R45, 10901 New Hampshire Avenue, Silver Spring, Maryland 20903-5000 (USA)
The longitudinal magnetostriction ({Delta}{ital l}/{ital l}) for twinned Tb{sub {ital x}}Dy{sub 1{minus}{ital x}}Fe{sub 1.95} material, prepared by the free-standing float-zone method, has been previously measured and found to be very large (2000{times}10{sup {minus}6}) at room temperature. The magnetostrictions for the (111) and (1{bar 1}0) crystallographic axes perpendicular to the applied stress and magnetic-field (11{bar 2}) direction are presented as functions of temperature, applied stress, and applied magnetic field. The temperature range is {plus minus}60 {degree}C centered about the anisotropy compensation temperature of Terfenol-D (+10 {degree}C). The stress ranges from 2 to 32 MPa and the magnetic field to {plus minus}2000 Oe. The temperature dependence of the perpendicular axes magnetostriction is similar to that of the conventional magnetostriction measured parallel to the (11{bar 2}) growth axis. Relative values for the saturation magnetostriction exhibit a large anisotropy in the perpendicular direction, ranging from {minus}117% for the (111) to +19% for the (1{bar 1}0) direction. This ratio stays constant as a function of temperature above the compensation temperature for a given prestress above 8 MPa. The largest absolute value of magnetostriction (2260{times}10{sup {minus}6}) occurs in the (111) direction at 10 {degree}C at a prestress pressure of 12 MPa. Above this temperature the magnetostriction falls at a rate of {minus}8.5{times}10{sup {minus}6}/{degree}C. The volume magnetostriction is shown to be small and highly sample dependent. All data is consistent with the parent-twin magnetization model and also the magnetostriction values along nonprincipal axes.
- OSTI ID:
- 6906400
- 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
Similar Records
Domain observation and magnetostriction in Tb sub 0. 3 Dy sub 0. 7 Fe sub 2 twinned single crystals
Magnetostriction and anisotropy of twin-free single-crystals Tb{sub 0.5}Dy{sub 0.5}(Fe{sub 0.9}Mn{sub 0.1}){sub 2}
Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ANISOTROPY
DYSPROSIUM ALLOYS
IRON ALLOYS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETOSTRICTION
MEDIUM TEMPERATURE
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
STRESSES
TEMPERATURE DEPENDENCE
TERBIUM ALLOYS
TWINNING
VERY HIGH PRESSURE