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0LOW TEMPERATURE HIGH FREQUENCY EPR ABSORPTION OF Fe45Co30Si10B15 MICROWIRE
Shestakov A.V.1, Semeno A.V.1, Demishev S.V.2, Rodionova V.V.3, Kolesnikova V.G.3
1Prokhorov General Physics Institute of the RAS, Moscow, Russia, alekseivshestakov@gmail.com, semeno@lt.gpi.ru 2Institute for High Pressure Physics of the RAS, Troitsk, Moscow, Russia,
sergey_demishev@mail.ru, Immanuel Kant Baltic Federal University, Kaliningrad, Russia valeriarodionova@gmail.com, vakolesnikovag@gmail.com
Thin ferromagnetic metallic glass-coated microwire of Fe45Co3oSiioBi5 was produced by the Taylor-Ulitovsky method under water or air cooling. It demonstrated various types of the magnetization reversal: bistable, stepwise, and S shape with a highly enhanced coercivity [1]. It was found that a system of Co-based microwires with nearly zero magnetostriction coefficient exhibits a step-like hysteresis loop [2]. The hysteresis loops of microwires magnetostrictive exhibit strong sensitivity to the ratio d/D [3]. The influence of post-processing conditions on the magnetic properties of amorphous and nanocrystalline microwires have been thoroughly analyzed, paying attention on the influence of magnetoelastic, induced and magnetocrystalline anisotropies on the hysteresis loops of Fe-, Ni- and Co-rich microwires [4].
Using the high frequency (60 GHz) EPR, microwave (MW) absorption spectra were obtained at temperatures from 4.2 to 30 K and in magnetic fields up to 40 kOe. Several microwires were located at the bottom of a cylindrical resonator along the diameter, i.e. along the MW magnetic component. Resonant absorption is observed at g ~ 2, as well as non-resonant absorption in the field range 3 ^ 6.5 kOe possessing hysteresis-like behavior (Fig. 1). The nature of the observed low temperature magnetization dynamics is discussed.
Fig. 1 (a) Microwave power absorption in Fe45Co3oSiioBi5 microwire at 4< r(K)<30, (b) "Hysteresis" behavior in the spectrum (arrows indicate changes in magnetic field).
References
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2. Rodionova V.V.,Chichay K., Zhukova V, Perov N.S., Ipatov M,Umnov P., Molokanov V., Zhukov A. // J Supercond Nov Magn. - 2014. - T. 28. - C. 977-981.
3. Zhukov A., Ipatov M., Zhukova V. // Abstarct Book II-Moscow Readings (MISIS), Cher-nogolovka - 2011. - C. 62.
4. Zhukova V. Corte-Leon P., Gonzalez-Legarreta L., Talaat A., Blanco J.M., Ipatov M., Olivera J. Zhukov A. // Opt. of Magn.Properties of Magn. Microwires by Post-Processing - 2020, 8, -C.1006.
