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10.02.2020 | ICFSMA 2019 | Ausgabe 1/2020

Shape Memory and Superelasticity 1/2020

Large Non-ergodic Magnetoelastic Damping in Ni–Mn–Ga Austenite

Zeitschrift:
Shape Memory and Superelasticity > Ausgabe 1/2020
Autoren:
Lucie Bodnárová, Petr Sedlák, Oleg Heczko, Hanuš Seiner
Wichtige Hinweise
This article is an invited submission to Shape Memory and Superelasticity selected from presentations at the International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA) held on June 2–7, 2019, in Prague, Czech Republic, and has been expanded from the original presentation.

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Abstract

Resonant ultrasound spectroscopy was used to analyze magnetoelastic damping in Ni–Mn–Ga single crystals in austenite and premartensite phases. Crystals with different treatment were studied, exhibiting different density of antiphase boundaries (APBs), as confirmed by magnetic force microscopy, and different magnetic behavior. For a quenched single crystal with high density of APBs, extremely strong damping was observed in a broad temperature range in the austenite phase. It was shown that this damping is history-dependent, i.e., non-ergodic, appearing only during heating runs preceded by a premartensite → austenite transition. We suggest that this non-ergodicity results from the pinning of the fine magnetic domain structure on APBs and other defects.

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