TITLE: Development of glass-coated microwires from Heusler alloys
AUTHOR: Arcady Zhukov, Dep. Applied Physics, Univ. Basque Country, UPV/EHU, 20018 San Sebastian, Spain
INVITED BY: Manuel Vázquez, ICMM-CSIC
WHEN: Monday, June 15 - 11.30h.
WHERE: Salón de Actos ICMM - Calle Sor Juana Inés de la Cruz, 3. Campus de Cantoblanco, ICMM-CSIC
ABSTRACT: Heusler alloys are attracting considerable attention owing to many interesting features as large magnetic field-induced strain, ferromagnetic shape-memory, magnetic field-induced martensitic transition, magnetocaloric effect, as well as magnetoresistance or half-metallic behaviour [1]. The modified Taylor-Ulitovsky technique has been successfully used to fabricate ultra-thin uniform glass-covered microwires (0.1-100 µm diam. metallic nucleus) covered by insulating glass coating (2-30 µm thick) [2].
The preparation, processing, magnetic and structural properties of Heusler-type glass-coated microwires of various alloys (i.e., NiMnGa, NiMnIn, CoMnSi, CoMnSiC, NiFeSi, CoFeSi, CoMnGe) will be presented with particular emphasis to the ordering temperature, Tc, near Troom and the temperature hysteresis of magnetization related to the 1st-order martensitic phase transition after properly annealed microwires. In short, we demonstrate that Taylor-Ulitovsky technology is a promising route to obtain large amount of unidimensional miniaturized Heusler alloy materials.
[1] D. Dunand, Adv. Mater. 23, 216 (2011); V. Chernenko, Scr. Mater. 40, 523 (1999); [2] A. Zhukov et al., “Heusler-type glass-coated microwires”, Ch.9., in “Magnetic Nano- and Microwires”, M. Vázquez ed. (Elsevier, 2020).
SHORT BIO: Prof. Arcady Zhukov received Ph.D. degree in 1988 from the Institute of Solid State Physics (Chernogolovka) of the Russian Academy of Science, and in 2010 Doctor of Science (habilitation) in Moscow State “Lomonosov” University. Since 2011, he is Ikerbasque Research Professor at the Department of Applied Physics of the University of Basque Country, where he is the Group Leader whose fields of interest include amorphous and nanocrystalline ferromagnetic materials, magnetic microwires, giant magnetoimpedance and magnetoresistance, and magnetoelastic sensors. He is a well acknowledged international expert on the topic of magnetic microwires, and published over 700 papers, 4 books, and many chapters (14.000 citations, H-index 62). In 2000, he founded the spin-off Tamag Iberica S.L., where he is currently the scientific supervisor. A. Zhukov is an IARIA Fellow, Editor of several Journals, Organizer of many international conferences and member of a number of international committees.
