Journal
APPLIED SURFACE SCIENCE
Volume 254, Issue 8, Pages 2556-2561Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2007.09.086
Keywords
nano-granular films; soft magnetic properties; henkel plot; exchange coupling; high frequency application
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A series of (Fe65Co35 +/- 2)(x) -(SiO1.7 +/- 0.2)(1-x) nano-granular films with various metal volume fractions (x) were fabricated by rf sputtering. In a wide range, excellent soft magnetic properties have been achieved. In the x range from 0.7 to 0.48, the films exhibit small coercivity Hc not exceeding 4 Oe and high electrical resistivity r up to 1.15 x 10(4) mu Omega cm. And a minimum Hc value of 1.65 Oe was obtained for the sample of x = 0.57 with rho = 2.86 x 10(3) mV cm. At a frequency lower than 2.0 GHz, the real part mu' of complex permeability of this sample is more than 170 and the FMR frequency is as high as 2.6 GHz, implying a high cut-off frequency for high frequency applications. With decreasing Fe65Co35 +/- 2 volume fraction, the resistivity of films increases remarkably and the grain size decreases obviously. At the same time, the coercivity Hc decreases with grain size decreasing, which is consistent with the conclusion resulted from random anisotropy model quoted by Herzer. Study on Henkel plots shows that intergranular ferromagnetic exchange coupling exists among grains and is important for realizing soft magnetic properties. (c) 2007 Elsevier B. V. All rights reserved.
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