Magnetic Domains and Twin Microstructure of Single Crystal Ni–Mn–Ga Exhibiting Magnetic Shape Memory Effect

Author

Heczko, Oleg ; Kopecky, Vit ; Fekete, Ladislav ; Jurek, Karel ; Kopecek, Jaromir ; Straka, Ladislav ; Seiner, Hanus

Author_Institution

Inst. of Phys., Prague, Czech Republic

Volume

51

Issue

11

fYear

2015

Firstpage

1

Lastpage

4

Abstract

Magnetic domains structure of a Ni-Mn-Ga single crystal was analyzed using a magneto-optical indicator film (MOIF), magnetic force microscopy (MFM), and scanning electron microscopy (SEM) (Lorenz contrast). Thanks to magnetically induced reorientation, the different configurations of magnetic domains can be obtained in the same place of the crystal. MOIF gives the overall domain configuration, while MFM shows the details of the structure revealing the domain branching. The magnetic domain structure in the vicinity of the mobile single twin boundary of Type II was observed by SEM and related to the complex twin structure of the martensite obtained from the calculation.

Keywords

gallium alloys; magnetic domains; magnetic force microscopy; magneto-optical effects; manganese alloys; nickel alloys; scanning electron microscopy; shape memory effects; twinning; Lorenz contrast; Ni-Mn-Ga; magnetic domains; magnetic force microscopy; magnetic shape memory effect; magnetically induced reorientation; magneto-optical indicator film; mobile single twin boundary; scanning electron microscopy; single crystal; twin microstructure; Magnetic domain walls; Magnetic domains; Magnetic resonance imaging; Mobile communication; Perpendicular magnetic anisotropy; Saturation magnetization; Magnetic Domain; Magnetic Shape Memory; Magnetic domain; NiMnGa; magnetic shape memory;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2015.2453054

Filename

7150406