CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Soft Magnetism and High Frequency Properties of Fe65Co35-MgF2 Granular Thin Films |
YAO Dong-Sheng1, GE Shi-Hui2, ZHOU Xue-Yun3, ZHANG Bang-Min2, ZUO Hua-Ping2 |
1Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Faculty of Science, Tianjin University, Tianjin 300072 2The Key Laboratory for Magnetism and Magnetic Materials, Lanzhou University, Lanzhou 730000 3Faculty of Science, Jiujiang University, Jiujiang 332005 |
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Cite this article: |
YAO Dong-Sheng, GE Shi-Hui, ZHOU Xue-Yun et al 2010 Chin. Phys. Lett. 27 067502 |
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Abstract (Fe65Co35)x(MgF2)1-x films with different metal volume fraction x are fabricated by magnetron sputtering. The results reveal that good soft magnetic properties can be obtained in a very wide x range (0.9> x >0.55) with Hc not exceeding 10 Oe, and high resistivity is also realized for the samples. Especially for the sample with x= 0.75, the coercivity in hard and easy axes is 1.6 Oe and 8.5 Oe, respectively, 4π Ms=14.1 kG and ρ reaches 1.16 mΩcdotcm. The dependence of complex permeability μ =μ- jμ'' on frequency shows that the real part μ' is more than 190 below 2.0 GHz and ferromagnetic resonance frequency fr reaches 2.43 GHz, implying that the film is promising for high frequency applications. High resolution transmission electron micrographs show that the films consists of bcc Fe65Co35 particles embedded uniformly in an amorphous insulating MgF2 matrix with particle size around a few nanometers. The excellent soft magnetic properties and high frequency properties are ascribed to exchange of coupling among magnetic granules, and the exchange coupling variation in a wide x range (0.9> x >0.55) is studied systematically byΔ M plots.
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Keywords:
75.70.-i
75.75.-a
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Received: 25 December 2009
Published: 25 May 2010
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PACS: |
75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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75.75.-a
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