| Summary: | 碩士 === 國立成功大學 === 材料科學(工程)學系 === 84 === Abstract
The Fe-Pt alloy films were prepared by D.C. planner magnetron
sputtering method under a argon pressure of 50 mtorr. The
distance of target to substrate was 4 cm. The microstructure and
magnetic properties of Fe-Pt alloy films were studied. The
effect of aging and dopping on the magneto-optical properties
werealso examined.
The range of Pt content in the films is 17.01-25.23at%. By
increasing thesputtering power, the Pt content becomes gradually
decreases. The microstruct- ure of as-deposited films is the
microcrystalline gamma-(Fe,Pt) phase with FCC structure.
When applied field is 14 kOe, the range of magnetization of
500-700 emu/c.c. are obtained. The coercive forces increase and
the magnetiza- tion decrease with increasing Pt content. The
Curie temperatures were measured in the range of 180 to 275 ℃.
The maximum Kerr angle of 0.25 degree could be obtained for the
sample of 21.96at% Pt. After aging, the crystalline structure of
Fe3Pt phase was formed. According to the size and number of Fe3
Pt particles,the coercivities, remanent, Kerr angle and Curie
temperature were changed.
The addition of V, Nb makes the as-deposited films becomes
amorphous moreeasily. Only adding small amount of V element can
increase the magnetic proper-ties of films. More addition causes
the reducing of magneto-optical properties.Additions would
enhance coercive forces ,while the Curie temperature decreases
slightly.
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