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Temperature dependence of microwave absorption phenomena in single and biphase soft magnetic microwires

AuthorsEl Kammouni, Rhimou; Vázquez Villalabeitia, Manuel ; Lezama, Luis; Kurlyandskaya, Galina; Kraus, Ludek
KeywordsMicrowave absorption
Ferromagnetic resonance
Magnetic microwire
Biphase magnetic system
Issue DateNov-2014
CitationJournal of Magnetism and Magnetic Materials 368: 126-132 (2014)
AbstractThe 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 μm diameter small-magnetostriction amorphous CoFeSiB single-phase microwire, coated by micrometric Pyrex layer, and after electroplating an external shell, 2 μm or 4 μm 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 field, H r, with temperature. A parallel reduction of the circular anisotropy field, HK, 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, Hr, in 2 and 4 μm 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.
Publisher version (URL)https://doi.org/10.1016/j.jmmm.2014.05.027
Identifiersdoi: 10.1016/j.jmmm.2014.05.027
issn: 0304-8853
Appears in Collections:(ICMM) Artículos
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