Antiphase boundaries in Ni-Mn-Ga single crystal - experiment and model

O. Heczko; F. Maca; V. Drchal; L. Fekete; L. Straka; J. Zemen

Antiphase boundaries in Ni-Mn-Ga single crystal - experiment and model

Materials Science 2025-10-20 v1

Authors: O. Heczko , F. Maca , V. Drchal , L. Fekete , L. Straka , J. Zemen

Abstract

Thermally induced antiphase boundaries (APBs) in ferromagnetic, ordered Ni-Mn-Ga single crystal exhibit complex, irregular shapes and closed loops without any lattice plane preferences. The APBs were visualized on polished (100) surface using magnetic force microscopy (MFM) at the same location in parent cubic austenite and monoclinic martensite with uniaxial magnetic anisotropy. Based on ab-initio calculation we suggest that one APB curve with dark and light contrast consists of a pair of APB interfaces with narrow, only one-layer thick, core with structural partial B2' order in contrast to full L21 order of bulk. Calculated magnetic contrast using magnetostatic continuum simulations agrees well with MFM observation.

Keywords

antiphase boundaries ni-mn-ga magnetic force microscopy ab-initio calculation magnetostatic simulation shape memory alloys

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@article{arxiv.2510.15433,
  title  = {Antiphase boundaries in Ni-Mn-Ga single crystal - experiment and model},
  author = {O. Heczko and F. Maca and V. Drchal and L. Fekete and L. Straka and J. Zemen},
  journal= {arXiv preprint arXiv:2510.15433},
  year   = {2025}
}

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9 pages, 4 figures

Antiphase boundaries in Ni-Mn-Ga single crystal - experiment and model

Abstract

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