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Effect of Dopants on the Soft Magnetic Properties and High Frequency Characteristics of FeCoBM (M = Ti, Nb, Hf, and Ta) Thin Films

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Effect of dopants on the soft magnetic properties and high frequency characteristics of FeCoBM thin films (M = Ti, Nb, Hf, and Ta) have been studied. For (Fe0.55Co0.45)100−x B x (x = 5–15) thin films, with the increase of B content, the resistivity was increased because B could decrease the crystallinity of the films. The (Fe0.55Co0.45)90B10 thin film showed the optimum properties, where 4πM s = 16.1 kG, H ce = 64.2 Oe, H ch = 13.5 Oe, H k = 310 Oe and ρ = 338 μΩ-cm. To reduce the coercivity of the film, the elements M, including Ti, Nb, Hf, and Ta, were selected to substitute for B in the FeCoB films. It was found that (Fe0.55Co0.45)90B6Ti2Nb2 thin film after annealing at a temperature of 200 °C for 30 min showed the optimal properties, where 4πMs = 15.8 kG, H ce = 4.8 Oe, H ch = 3.6 Oe, H k = 224 Oe and ρ = 290 μΩ-cm. The theoretically calculated ferromagnetic resonance frequency of the developed films can be higher than 5 GHz.
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Keywords: HIGH FREQUENCY; SOFT MAGNETISM; THIN FILM

Document Type: Research Article

Publication date: 01 March 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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