Title :
High frequency magneto-impedance effects in (Co-Ti-O)/Bi-Ti-O multilayer films
Author :
Kijima, H. ; Zhang, Ye ; Kobayashi, Nao ; Ohnuma, Shigehiro ; Muralt, Paul ; Setter, Nava ; Masumoto, Hiroshi
Author_Institution :
Frontier Res. Inst. for Interdiscipl. Sci., Tohoku Univ., Sendai, Japan
Abstract :
(Co-Ti-O)/Bi-Ti-O multilayer films with 9 Co-Ti-O layers are prepared by tandem sputtering. The high frequency soft magnetic properties and magneto-impedance effects were investigated in the frequency range from 0.1 to 10 GHz. The films maintain the real part of permeability μ\´ = 30 up to a few GHz, and exhibit a clear peak of imaginary part of permeability μ" = 76.4 at the resonance frequency (fr). The μ" value at fr decreases with increasing an external magnetic field (Hex) applied parallel to the rf magnetic field. From the frequency response of the films, the admittance (Y) shows notable change near fr, which decrease with increasing Hex.
Keywords :
bismuth compounds; cobalt compounds; high-frequency effects; magnetic multilayers; magnetic permeability; magnetic thin films; magnetoelectric effects; soft magnetic materials; sputter deposition; titanium compounds; CoTiO-BiTiO; admittance; frequency 0.1 GHz to 10 GHz; high frequency magneto-impedance effects; high frequency soft magnetic properties; magneto-impedance effects; multilayer films; permeability; resonance frequency; sputtering; Bismuth; Distance measurement; Magnetic films; high frequency soft magnetic properties; magneto-impedance effect; multifunctional properties; thin film;
Conference_Titel :
Applications of Ferroelectric and Workshop on the Piezoresponse Force Microscopy (ISAF/PFM), 2013 IEEE International Symposium on the
Conference_Location :
Prague
DOI :
10.1109/ISAF.2013.6748674