Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> Monocrystal
The article concerns the rarely described magnetic domain structure of Heusler alloys in the case of a single crystal [100]-oriented Co-Ni-Ga alloy. The structure of the magnetic domains of the alloy was compared in two states: in the quenched and additionally aged state. Ageing led to precipitation...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-02-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/10/3/153 |
| _version_ | 1811303288141774848 |
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| author | Andrzej M. Żak Wlodzimierz Dudzinski |
| author_facet | Andrzej M. Żak Wlodzimierz Dudzinski |
| author_sort | Andrzej M. Żak |
| collection | DOAJ |
| description | The article concerns the rarely described magnetic domain structure of Heusler alloys in the case of a single crystal [100]-oriented Co-Ni-Ga alloy. The structure of the magnetic domains of the alloy was compared in two states: in the quenched and additionally aged state. Ageing led to precipitation of the spherical phase γ’ nanoparticles (Co-rich, FCC lattice with a = 0.359 nm). Lorentz transmission electron microscopy observation methods combined with cooling and in situ heating of the sample in the transmission electron microscope in the temperature range from 140 K to 300 K were combined to observe the magnetic domain structure. Significant differences in the dimensions and morphology of magnetic domain boundaries have been demonstrated. The quenched sample showed no change in stripe domain structure when the aged sample showed significant development of branching magnetic structures. This may be due to a change in the chemical composition of the matrix resulting from a decrease in cobalt and nickel content at the expense of precipitations. |
| first_indexed | 2024-04-13T07:44:13Z |
| format | Article |
| id | doaj.art-f18a3023f694460082834971ffe24da4 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-13T07:44:13Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-f18a3023f694460082834971ffe24da42022-12-22T02:55:46ZengMDPI AGCrystals2073-43522020-02-0110315310.3390/cryst10030153cryst10030153Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> MonocrystalAndrzej M. Żak0Wlodzimierz Dudzinski1Wroclaw University of Science and Technology, Faculty of Mechanical Engineering, Electron Microscopy Laboratory, Wybrzeże Wyspianskiego 27, 50370 Wrocław, PolandWroclaw University of Science and Technology, Faculty of Technology and Engineering, Armii Krajowej 78, 58302 Wałbrzych, PolandThe article concerns the rarely described magnetic domain structure of Heusler alloys in the case of a single crystal [100]-oriented Co-Ni-Ga alloy. The structure of the magnetic domains of the alloy was compared in two states: in the quenched and additionally aged state. Ageing led to precipitation of the spherical phase γ’ nanoparticles (Co-rich, FCC lattice with a = 0.359 nm). Lorentz transmission electron microscopy observation methods combined with cooling and in situ heating of the sample in the transmission electron microscope in the temperature range from 140 K to 300 K were combined to observe the magnetic domain structure. Significant differences in the dimensions and morphology of magnetic domain boundaries have been demonstrated. The quenched sample showed no change in stripe domain structure when the aged sample showed significant development of branching magnetic structures. This may be due to a change in the chemical composition of the matrix resulting from a decrease in cobalt and nickel content at the expense of precipitations.https://www.mdpi.com/2073-4352/10/3/153magnetic shape memory alloymsmaconigalorentz temfresnel temmagnetic domaindomain walls |
| spellingShingle | Andrzej M. Żak Wlodzimierz Dudzinski Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> Monocrystal Crystals magnetic shape memory alloy msma coniga lorentz tem fresnel tem magnetic domain domain walls |
| title | Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> Monocrystal |
| title_full | Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> Monocrystal |
| title_fullStr | Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> Monocrystal |
| title_full_unstemmed | Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> Monocrystal |
| title_short | Microstructural and In Situ Lorentz TEM Domain Characterization of As-Quenched and γ’-Precipitated Co<sub>49</sub>Ni<sub>30</sub>Ga<sub>21</sub> Monocrystal |
| title_sort | microstructural and in situ lorentz tem domain characterization of as quenched and γ precipitated co sub 49 sub ni sub 30 sub ga sub 21 sub monocrystal |
| topic | magnetic shape memory alloy msma coniga lorentz tem fresnel tem magnetic domain domain walls |
| url | https://www.mdpi.com/2073-4352/10/3/153 |
| work_keys_str_mv | AT andrzejmzak microstructuralandinsitulorentztemdomaincharacterizationofasquenchedandgprecipitatedcosub49subnisub30subgasub21submonocrystal AT wlodzimierzdudzinski microstructuralandinsitulorentztemdomaincharacterizationofasquenchedandgprecipitatedcosub49subnisub30subgasub21submonocrystal |