Atomic Topology and Magnetic Microstructure of Highly Mobile Type I and Supermobile Type II Twin Boundaries in 10M Ni-Mn-Ga Single Crystal
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arXiv
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2025
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| author | Straka, Ladislav Vronka, Marek Maňák, Jan Veřtát, Petr Seiner, Hanuš Heczko, Oleg |
| author_facet | Straka, Ladislav Vronka, Marek Maňák, Jan Veřtát, Petr Seiner, Hanuš Heczko, Oleg |
| contents | The atomic topology and magnetic microstructure of individual, highly mobile Type I and Type II twin boundaries in 10M Ni-Mn-Ga martensite were investigated by transmission electron microscopy (TEM). The twin boundaries established in a bulk single crystal showed twinning stresses of ~1 MPa for Type I and ~0.1 MPa for Type II twin boundaries. TEM lamellae with a (010) cross-section, their c-axis (easy-magnetization direction) lying in-plane, were prepared by focused ion-beam milling, each containing a single twin boundary of specific type. High-resolution TEM confirmed an atomically sharp Type I twin boundary oriented along the rational (101) plane. The Type II boundary was also atomically sharp, apart from occasional single-atomic-plane steps. This contrasts with previous suggestions of its diffuse nature. Lorentz TEM showed 180° domain walls within martensite variants. The magnetic induction reorients sharply on both twin boundaries, forming 90°-like magnetic domain walls that follow the c-axis easy-magnetization direction. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_14096 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Atomic Topology and Magnetic Microstructure of Highly Mobile Type I and Supermobile Type II Twin Boundaries in 10M Ni-Mn-Ga Single Crystal Straka, Ladislav Vronka, Marek Maňák, Jan Veřtát, Petr Seiner, Hanuš Heczko, Oleg Materials Science The atomic topology and magnetic microstructure of individual, highly mobile Type I and Type II twin boundaries in 10M Ni-Mn-Ga martensite were investigated by transmission electron microscopy (TEM). The twin boundaries established in a bulk single crystal showed twinning stresses of ~1 MPa for Type I and ~0.1 MPa for Type II twin boundaries. TEM lamellae with a (010) cross-section, their c-axis (easy-magnetization direction) lying in-plane, were prepared by focused ion-beam milling, each containing a single twin boundary of specific type. High-resolution TEM confirmed an atomically sharp Type I twin boundary oriented along the rational (101) plane. The Type II boundary was also atomically sharp, apart from occasional single-atomic-plane steps. This contrasts with previous suggestions of its diffuse nature. Lorentz TEM showed 180° domain walls within martensite variants. The magnetic induction reorients sharply on both twin boundaries, forming 90°-like magnetic domain walls that follow the c-axis easy-magnetization direction. |
| title | Atomic Topology and Magnetic Microstructure of Highly Mobile Type I and Supermobile Type II Twin Boundaries in 10M Ni-Mn-Ga Single Crystal |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.14096 |