Influence of multiple magnetic phases on the extrinsic damping of FeCo-SiO{sub 2} soft magnetic films

Journal Article · Sun Feb 14 23:00:00 EST 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3289588· OSTI ID:21476129

Bailin, Liu; Yi, Yang; Dongming, Tang; Jiangwei, Chen; Huaixian, Lu; Mu, Lu; Yi, Shi ^[1]

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1. Department of Physics, Nanjing University, Nanjing, Jiangsu 210093 (China)

In order to investigate the high-frequency damping properties of the ferromagnetic film for the electromagnetic shielding applications, a series of (FeCo){sub 2x}/(Fe){sub x}/(SiO{sub 2}){sub 1-3x} nanogranular films with various volume fractions (x) were fabricated by alternate triple-target magnetron sputtering. The (FeCo){sub 0.50}/Fe{sub 0.25}/(SiO{sub 2}){sub 0.25} film shows excellent soft magnetic properties (4{pi}M{sub s{approx}}1.48 T, H{sub ce{approx}}4.3 Oe, {rho}{approx}4.3 {mu}{Omega} m). In both ferromagnetic resonance (FMR) and frequency-dependent permeability spectra measurements, two resonance peaks of the permeability for this film are obtained, which can be attributed to the complicated magnetic structure of FeCo and Fe phases in the film. This multiphase system makes an additional contribution to the extrinsic damping. As a result, the higher natural resonance frequency f for the film is up to 2.75 GHz with full width at half maximum of about 2.5 GHz for the imaginary part {mu}{sup ||}; meanwhile, the real part {mu}{sup /} is as high as 650 while f<1.3 GHz. These films could be novel candidates for the electromagnetic shielding applications.

• OSTI ID: 21476129
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 3 Vol. 107; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ANISOTROPY
CHALCOGENIDES
COBALT ALLOYS
DAMPING
DEPOSITION
FERROMAGNETIC MATERIALS
FERROMAGNETIC RESONANCE
FILMS
FREQUENCY DEPENDENCE
FREQUENCY RANGE
GHZ RANGE
IRON ALLOYS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MAGNETIC SUSCEPTIBILITY
MATERIALS
NANOSTRUCTURES
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PHYSICAL PROPERTIES
RESONANCE
SILICON COMPOUNDS
SILICON OXIDES
SPUTTERING
THIN FILMS
TRANSITION ELEMENT ALLOYS