S Ohnuma et al 2009 J. Phys.: Conf. Ser. 191 012020 doi:10.1088/1742-6596/191/1/012020
S Ohnuma, N Kobayashi, H Fujimori and T Masumoto
Show affiliationsMetal-Insulator type nano-granular magnetic (NGM) thin films have been noteworthily developed as several functional magnetic materials. The formation of nano-granular structure is strongly related to the magnitude of heat formation (ΔH) of intergranule materials. Forming a larger ΔH allows a clearer granular structure to be obtained. Soft magnetic properties and TMR effect of NGM films are reviewed in this article, including their applications. The HRTEM observation reveals that average distance among neighboring granules mainly controls magnetic properties in NGM films. Co-O based NGM film where granules contact each other has soft magnetism and exhibits an excellent frequency response of permeability, while the film with isolated granules is superparamagnetic state and shows giant magnetostriction effect. Both large electromagnetic noise suppression and low field magnetic sensing effects are demonstrated as their applications.
75.70.Ak Magnetic properties of monolayers and thin films
75.75.+a Magnetic properties of nanostructures
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction
Condensed matter: electrical, magnetic and optical
Instrumentation and measurement
Issue 1 (2009)
S Ohnuma et al 2009 J. Phys.: Conf. Ser. 191 012020
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