Abstract
We prepared Heusler-type Ni–Mn–Ga glass-coated microwires with total diameters, D, from 16 until 65 μm consisted of a metallic nucleus with diameters, d, between 10 and 31 μm and surrounded by the glass coating by the Taylor–Ulitovsky technique and measured the magnetocaloric effect, MCE, by the recently introduced precise method allowing the detection of a change in the temperature, ΔT, with an accuracy of below 10−3 K. As-prepared microwires did not show ferromagnetic ordering at least near room temperature. Annealing above 773 K even for few minutes results in drastic change of magnetic properties: annealed sample show magnetization versus temperature dependence typical for ferromagnetic behavior with the Curie temperature about 315 K.
Analysis of the X-ray diffraction allows us to identify presence of cubic phase in as-prepared state with the space group Fm3m and some amount of the tetragonal phase with space group I4/mmm.
We measured directly the MCE, ΔT, in annealed samples. Before glass removal, we observed ΔT≈0.06 K for sample 1 and 0.08 K for sample 2. After glass removal of sample 1, ΔT increased until 0.22 K.
Observed MCE is associated with magnetic (paramagnetic–ferromagnetic) and probably structural (austenite–martensite) phase transitions. Temperatures of the peak values of MCE were found to be of ∼318 K and ∼309 K, respectively
Use of the glass-coating fabrication technique allows fabrication of composite thin wires from the brittle Ni–Mn–Ga alloy that cannot be cold-drawn to create fibers by conventional methods.
Similar content being viewed by others
References
Ullakko, K., Huang, J.K., Kantner, C., O’Handley, R.C.: Appl. Phys. Lett. 69, 1966 (1996)
Ma, J., Karaman, I.: Science 327, 1468 (2010)
Ponomarev, B.K., Ivanov, S.A., Negrii, V.D., Zhukov, A.P., Red’kin, B.S., Kurlov, V.N., Zvezdin, A.K., Popov, Yu.F.: Ferroelectrics 151, 103 (1994)
Dunand, D.C., Müllner, P.: Adv. Mater. 23, 216 (2011)
Nespoli, A., Besseghini, S., Pittaccio, S., Villa, E., Viscuso, S.: Sens. Actuators A 158, 149 (2010)
Gschneidner, K.A., Pecharsky, V.K., Tsokol, A.O.: Rep. Prog. Phys. 68, 1479 (2005)
Chernenko, V.A., Ohtsuka, M., Kohl, M., Khovailo, V.V., Takagi, T.: Smart Mater. Struct. 14, S245 (2005)
Zhukov, A., Zhukova, V.: Magnetic Properties and Applications of Ferromagnetic Microwires with Amorphous and Nanocrystalline Structure, vol. 11788, pp. 162. Nova Science Publishers, Hauppauge (2009). ISBN: 978-1-60741-770-5
Vazquez, M., Chiriac, H., Zhukov, A., Panina, L., Uchiyama, T.: Phys. Status Solidi A 208(3), 493 (2011)
Zhukova, V., Ipatov, M., Zhukov, A.: Sensors 9, 9216 (2009)
Zhukov, A., Gonzalez, J., Zhukova, V.: J. Magn. Magn. Mater. 294, 165 (2005)
Zhukov, A., Garcia, C., Zhukova, V., Larin, V., Gonzalez, J., del Val, J.J., Knobel, M., Blanco, J.M.: J. Non-Cryst. Solids 353, 922 (2007)
Ilyn, M.I., Zhukova, V., Santos, J.D., Sanchez, M.L., Prida, V.M., Hernando, B., Larin, V., Gonzalez, J., Tishin, A.M., Zhukov, A.: Phys. Status Solidi A 205, 1378 (2008)
Varga, R., Ryba, T., Vargova, Z., Saksl, K., Zhukova, V., Zhukov, A.: Scr. Mater. 65, 703 (2011)
Garcıa, C., Prida, V.M., Vega, V., Sanchez Llamazares, J.L., Suñol, J.J., Escoda, L., Sanchez, M.L., Ribot, J., Hernando, B.: Phys. Status Solidi A 206, 644 (2009)
Aliev, A.M., Batdalov, A.B., Kalitka, V.S.: JETP Lett. 90, 663 (2009)
Pakhomov, A.B., Wong, C.Y., Zhang, X.X., Wen, G.H., Wu, G.H.: IEEE Trans. Magn. 37(4), 2718 (2001)
Acknowledgements
This work was supported by EU ERA-NET programme under project “SoMaMicSens” (MANUNET-2010-Basque-3), by EU under FP7 “EM-safety” project, by the Spanish Ministry of Science and Innovation, MICINN under Project MAT2010-18914, by the Basque Government under Saiotek 12 MEMFOMAG project (S-PE12UN139), by the Slovak VEGA Grant No. 1/0076/09, and by the Russian RFBR 11-02-01124-a project.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhukova, V., Aliev, A.M., Varga, R. et al. Magnetic Properties and MCE in Heusler-Type Glass-Coated Microwires. J Supercond Nov Magn 26, 1415–1419 (2013). https://doi.org/10.1007/s10948-012-1978-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10948-012-1978-2