日本金属学会誌

J. Japan Inst. Metals, Vol. 61, No. 6 (1997),
pp. 502-506

Magnetic Properties and GMR in Fe-Cu Granular FilmsPrepared by Ionized Cluster Beam Technique

Kimio Wakoh, Masanori Yosida, Toyohiko J. Konno,Takehiko Hiharat, Marburg D-35043, Germany}, Kenji Sumiyama and Kenji Suzuki

Institute for Materials Research, Tohoku University, Sendai 980-77

Abstract:

Fe cluster dispersed Fe-Cu granular films have been produced by an ionized cluster beam (ICB) technique. Magnetoresistance (MR) and magnetic properties were observed for Fe-Cu films produced at different acceleration voltages (Va=0 and 2.5 kV). The chemical composition of the films prepared at Va=2.5 kV is Fe-richer than the designed one, indicating the ``resputtering'' of Cu atoms from the deposited films. These films exhibit giant magnetoresistance (GMR), which does not saturate even at high fields: conduction-electrons suffer spin-disorder scattering. With increasing Fe concentration, the MR values of these granular films monotonically decrease, whereas those of the sputtered and thermally evaporated films show maxima at around 25 at%Fe. The disappearance of the MR maximum is ascribed to the presence of antiferromagnetic Fe clusters. In addition, the MR values of the ICB-deposited films prepared at Va=2.5 kV are higher than those at Va=0 kV, indicating that the former is smaller in the average cluster size than the latter.


(Received March 10, 1997)

Keywords:

iron-copper, granular material, magnetoresistance, ionized cluster beam, acceleration voltage


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.