Ultrafast actuation of Ni-Mn-Ga micropillars by pulsed magnetic field. (15th March 2019)

• Record Type: Journal Article
• Authors: Musiienko, Denys; Saren, Andrey; Straka, Ladislav; Vronka, Marek; Kopeček, Jaromír; Heczko, Oleg; Sozinov, Alexei; Ullakko, Kari
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 482
• Page End: 485
• Publication Date: 2019-03-15
• Subjects: Ferromagnetic shape memory -- Twinning -- Nanoindentation -- Focused ion beam -- Ni-Mn-Ga micropillars; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.12.009
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We report on the pulsed magnetic field actuation of single crystalline Ni-Mn-Ga cuboid micropillars with dimensions of 40 × 45 × 120 μm 3, created by focused ion beam milling followed by electrochemical etching. Based on the experimental and modelled results, we differentiate between type I and type II twin boundary motion in the micropillar, which display about an order difference in actuation velocities. Magnetically-induced reorientation of a micropillar was obtained in less than 5 μs by type II twin boundary motion. Our results suggest the possibility of fabrication of magnetic shape memory microdevices with working frequencies up to 100 kHz. Graphical Abstract: