2026-04-17T10:48:38Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/158302024-06-18T11:50:18Zcom_2072_452955com_2072_2054col_2072_453063

Ni59.0Mn23.5In17.5 Heusler alloy as the core of glass-coated microwires: Magnetic properties and magnetocaloric effect Vega, V. Gonzalez-Mestres, Luis García Fernández, Javier Rosa, W. O. Serantes Abalo, David Prida Pidal, Victor Manuel de la Badini, G. Varga, Rastislav Suñol Martínez, Joan Josep Hernando, Blanca Aliatges Alloys Aliatges amb memòria de forma Shape memory alloys Anàlisi tèrmica Thermal analysis Metalls -- Aliatges Metals -- Alloys Heusler Ni59.0Mn23.5In17.5alloy was prepared as the metallic core of a glass-coated microwire with a total diameter of 41.8 μm. X-ray diffractograms performed at room temperature and 100 K show a highly ordered L21cubic structure characteristic of the austenitic phase in Heusler alloys. Thermomagnetic curves measured in the temperature range from 50 K up to 400 K show ferromagnetic coupling in the austenite with the Curie temperature around 246 K. Hysteresis loops measured at different temperatures indicate a soft ferromagnetic behaviour, confirming the microwire axis as the magnetization easy direction. The magnetic entropy variation reaches a maximum value of 1.75 J/kgK at the ferro-to-paramagnetic phase transition for a magnetic field change of 30 kOe. After short annealing, the Curie temperature is almost unchanged while the maximum entropy change increases up to 2.01 J/kgK. Refrigerant capacity and its dependence on both working temperature range and applied field value are evaluated for all microwire samples, reaching 120 J/kg for a 30 kOe magnetic field variation. We analyze the possibility of employing microwire shape Heusler alloys as low field magnetocaloric micro-devices and solid-state actuators 2024-06-18T11:50:18Z 2024-06-18T11:50:18Z 2024-06-18T11:50:18Z 2012-08-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion peer-reviewed http://hdl.handle.net/10256/15830 info:eu-repo/semantics/altIdentifier/doi/10.1063/1.4740466 info:eu-repo/semantics/altIdentifier/issn/0021-8979 info:eu-repo/semantics/altIdentifier/eissn/1089-7550 Tots els drets reservats info:eu-repo/semantics/openAccess American Institute of Physics (AIP) © Journal of Applied Physics, 2012, vol. 112, p. 033905 Articles publicats (D-F)