TY - JOUR

T1 - Direct observation of nano-dimensional internal structure of ferromagnetic domains in the ferromagnetic shape memory alloy Co-Ni-Ga

AU - Gerstein, G.

AU - L'vov, V. A.

AU - Żak, A.

AU - Dudziński, W.

AU - Maier, H. J.

N1 - Funding information: This work was supported by the Deutsche Forschungsgemeinschaft (DFG) under grant FOR 1766 TP4 (MA 1175/34-2), Germany. V.A.L. acknowledges the support from the Projects 0117U000433 of NAS and 0117U004340 of MES, Ukraine. The authors thank Prof. Chumlyakov for providing the single crystals.

PY - 2018/11/15

Y1 - 2018/11/15

N2 - The Displaced Aperture Method (DAM) of Transmission Electron Microscopy (TEM) is used to visualize internal structure of magnetic domains in the Co49-Ni21-Ga30 Ferromagnetic Shape Memory Alloy (FSMA). The preparation of the FSMA specimens and the details of DAM enabling visualization of these domains and their internal details are described. The magnetic domains of ca. 100-nm width with the domain walls of ca. 20 nm width are observed. The theoretical estimation supporting the possibility of appearance of such domains in the thin foil prepared for TEM observations is presented. The superfine crystallographic microstructure possessing the features, which are inherent to the quasiperiodic twinning of crystal lattice with period of ca. 6 nm, is observed inside the magnetic domains. The obtained TEM data may be useful for examination of the influence of external magnetic field on the magnetic and crystallographic microstructure of FSMAs.

AB - The Displaced Aperture Method (DAM) of Transmission Electron Microscopy (TEM) is used to visualize internal structure of magnetic domains in the Co49-Ni21-Ga30 Ferromagnetic Shape Memory Alloy (FSMA). The preparation of the FSMA specimens and the details of DAM enabling visualization of these domains and their internal details are described. The magnetic domains of ca. 100-nm width with the domain walls of ca. 20 nm width are observed. The theoretical estimation supporting the possibility of appearance of such domains in the thin foil prepared for TEM observations is presented. The superfine crystallographic microstructure possessing the features, which are inherent to the quasiperiodic twinning of crystal lattice with period of ca. 6 nm, is observed inside the magnetic domains. The obtained TEM data may be useful for examination of the influence of external magnetic field on the magnetic and crystallographic microstructure of FSMAs.

KW - Domain walls

KW - Ferromagnetic domains

KW - Magnetic shape memory alloy

KW - Nano scale

KW - Transmission electron microscopy

KW - Twinning

UR - http://www.scopus.com/inward/record.url?scp=85049440150&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2018.06.066

DO - 10.1016/j.jmmm.2018.06.066

M3 - Article

AN - SCOPUS:85049440150

VL - 466

SP - 125

EP - 129

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

ER -