Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 368, Issue -, Pages 126-132Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2014.05.027
Keywords
Magnetic microwire; Ferromagnetic resonance; Microwave absorption; Biphase magnetic system
Funding
- Spanish Ministerio de Economia y Competitividad [MAT2010-02798-C05-01]
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The microwave absorption phenomena of single and biphase magnetic microwires with soft magnetic behavior have been investigated as a function of DC applied magnetic field using two alternative techniques: (i) absorption measurements in the temperature range of 4-300 K using a spectrometer operating at X-band frequency, at 9.5 GHz, and (ii) room temperature, RT, ferromagnetic resonance measurements in a network analyzer in the frequency range up to 20 GHz. Complementary low frequency magnetic characterization was performed in a Vibrating Sample Magnetometer. Studies have been performed for 8 pm diameter small-magnetostriction amorphous CoFeSiB single-phase microwire, coated by micrometric Pyrex layer, and after electroplating an external shell, 2 mu m or 4 mu m thick, of FeNi alloys. For single phase CoFeSiB microwire, a single absorption is observed, whose DC field dependence of resonance frequency at RT fits to a Kittel-law behavior for in-plane magnetized thin film. The temperature dependence behavior shows a monotonic increase in the resonance held, H-r, with temperature. A parallel reduction of the circular anisotropy held, H-K, is deduced from the temperature dependence of hysteresis loops. For biphase, CoFeSiB/FeNi, microwires, the absorption phenomena at RT also follow the Kittel condition. The observed opposite evolution with temperature of resonance field, H-r, in 2 and 4 mu m thick FeNi samples is interpreted considering the opposite sign of magnetostriction of the respective FeNi layers. The stress-induced magnetic anisotropy field, H-K, in the FeNi shell is deduced to change sign at around 130 K. (C) 2014 Elsevier B.V. All rights reserved.
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