Soft Magnetic Thin Films Composed of Ultra Fine Crystallites

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Soft Magnetic Properties of Fe Based Nano-Crystalline Thin Films: FeHFC then films and Fe/FeHFC multilayered thin films were prepared by a sputter method. The FeHFC was amorphous in the as-prepared state, while it transformed into the mano-crystalline state by a heat treatment. The Fe layers were in the nano-crystalline state even without heat treatment. As a result, both the films showed excellent soft magnetic properties. Particularly, the Fe/FeHFC multilayers were superior in high magnetic induction, because of the high concentration of Fe. In addition. it was found that the nano-crystalline state in the multilayers was stable up to high temperatures as about 700ﾟC. The stability was thought to be attributed to the pinning effect of the HFC fine crystallites precipitated at the boundaries of Fe fine crystallites.Giant Magnetoresistance in Co-Fe/Cu and Co-X/Cu Multilayered Thin Films: It was found that the magnetostriction depended on the alloying elements into Co and about 10 at% of Fe gave rise to an enhanced magnetoresistance, larger than that of Co/Cu multilayer. Moreover, we succeeded to reduce the magnetic field for exciting magnetoresistance in the new multilayer of Co-Fe/Cu/Co-Fe.Magnetostriction in TbFe_2-B and SmFe_2-B Amorphous Alloys: Huge magnetostrictions saturated easyly in low magnetic fields (about 60 x 10^<-6> at 200 Oe) were obtained in TbFe_2-B and SmFe_2-B amorphous alloys prepared by a high rate sputtermethod.