Magnetostrictive properties of amorphous and partially crystalline TbDyFe thin films

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364871· OSTI ID:496617

Speliotis, A ^[1]; Kalogirou, O ^[2]; Niarchos, D ^[1]

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1. Institute for Materials Science, NCSR Demokritos, 153 10 Ag. Paraskevi, Attiki (Greece)
2. Third Laboratory of Physics, Department of Physics, Aristotle University of Thessaloniki, 54006 Thessaloniki (Greece)

A series of amorphous and partially crystalline giant magnetostrictive thin films of the composition (Tb{sub 0.3}Dy{sub 0.7}){sub 39}Fe{sub 61} has been prepared by dc magnetron sputtering. The sputtering conditions were the same for all samples apart from the substrate temperature T{sub S}, which varied between 330 and 510{degree}C. The crystalline state and the magnetic properties of the samples were investigated in relation to the substrate temperature. Films deposited at T{sub S}=330{endash}400{degree}C were amorphous. Crystallization started at T{sub S}=425{degree}C. The magnetostrictive coefficient {lambda}, at 4 kOe and at room temperature, increased with increasing T{sub S} from 185 to 750 ppm at H{sub max}. This was related also to an increase of the Curie temperature T{sub C} from 35 to 315{degree}C. The hysteresis loops of the amorphous samples showed coercivities lower than 10 Oe. These samples presented {lambda}{approx}300 ppm in a field of 1000 Oe. The direction of the magnetic moments in the amorphous films changed gradually from perpendicular to parallel to the film plane with increasing T{sub S}. The samples deposited at T{sub S}{ge}425{degree}C showed {lambda}{sub max}{approx}350{endash}750 ppm, but the magnetostrictive curve was much broader and shifted to the value of H{sub c}. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496617
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
COERCIVE FORCE
CRYSTALLIZATION
CURIE POINT
DYSPROSIUM ALLOYS
FERRIMAGNETIC MATERIALS
IRON ALLOYS
MAGNETIC MOMENTS
MAGNETOSTRICTION
SPUTTERING
TEMPERATURE DEPENDENCE
TERBIUM ALLOYS
THIN FILMS