Magnetoelastic ultrasonic generation in TbFe$sub 2$ thin films

Conference · Tue Dec 31 23:00:00 EST 1974 · AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 653-654

OSTI ID:4200436

McLane, L B; Donoho, P L; Wimbush, W L

Ultrasonic elastic waves were magnetostrictively generated at room temperature in polycrystalline films of TbFe$sub 2$ deposited on quartz and sapphire substrates at a frequency of 690 MHz. The maximum generation efficiency was approximately 50 times that of nickel films deposited under similar conditions. In the case of deposition at substrate temperatures above 320$sup 0$C, the films exhibited a strong magnetic anisotropy, with the easy axis invariably perpendicular to the plane of the film. This anisotropy led to coercive forces as high as 6 kOe and remanent magnetizations as high as 80 percent of the saturation magnetization. As a result, efficient generation of elastic waves could be achieved in films with no applied field if they had previously been magnetized. The field dependence of the ultrasonic generation and the magnetic anisotropy were found to be strongly dependent on the film thickness and on certain deposition parameters, particularly the substrate temperature, as indicated above. Annealing of the films subsequent to deposition also affected strongly the anisotropy and the ultrasonic generation efficiency. In all cases, however, the magnetic easy axis was perpendicular to the plane of the film (it should be pointed out that deposition was not carried out in the presence of a field). (auth)

• Research Organization: Rockwell International, Inc., Dallas
• NSA Number: NSA-33-003601
• OSTI ID: 4200436
• Journal Information: AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 653-654, Journal Name: AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 653-654; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

*IRON ALLOYS-- MAGNETOSTRICTION
*TERBIUM ALLOYS-- MAGNETOSTRICTION
360104* --Materials--Metals & Alloys--Physical Properties
ANISOTROPY
ANNEALING
COERCIVE FORCE
FILMS
MAGNETIC PROPERTIES
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
THICKNESS
ULTRASONIC WAVES