Nature of the magnetic and structural phase transition in MnAs/GaAs(001)
In the bulk the structural and magnetic phase transitions between α- and β-MnAs are coupled and proceed abruptly by first order. In heteroepitaxially constrained MnAs/GaAs(001) films, on the other hand, the two phases coexist at 10-40 °C and the magnetization decreases continuously with temperature....
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2004
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| _version_ | 1797101973909012480 |
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| author | Ney, A Hesjedal, T Pampuch, C Das, A Daweritz, L Koch, R Ploog, K Tolinski, T Lindner, J Lenz, K Baberschke, K |
| author_facet | Ney, A Hesjedal, T Pampuch, C Das, A Daweritz, L Koch, R Ploog, K Tolinski, T Lindner, J Lenz, K Baberschke, K |
| author_sort | Ney, A |
| collection | OXFORD |
| description | In the bulk the structural and magnetic phase transitions between α- and β-MnAs are coupled and proceed abruptly by first order. In heteroepitaxially constrained MnAs/GaAs(001) films, on the other hand, the two phases coexist at 10-40 °C and the magnetization decreases continuously with temperature. We present detailed magnetic measurements on MnAs/GaAs(001) in the phase transition region covering the ferromagnetic a phase, the paramagnetic β phase and the α + β coexistence region. The coexistence of two magnetically distinguishable types of α-MnAs around the onset of the coexistence region at 10 °C, the occurrence of metastable magnetic properties, and the absence of a Curie-Weiss peak in the susceptibility point to a first order of the magnetic phase transition also in thin films. The two types of α-MnAs are characterized by different coercivity and magnetic anisotropy, the latter due to a change in shape anisotropy of the striped phase. |
| first_indexed | 2024-03-07T05:59:22Z |
| format | Journal article |
| id | oxford-uuid:eba44726-114a-4038-884a-d52c4ab41331 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:59:22Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:eba44726-114a-4038-884a-d52c4ab413312022-03-27T11:11:29ZNature of the magnetic and structural phase transition in MnAs/GaAs(001)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:eba44726-114a-4038-884a-d52c4ab41331EnglishSymplectic Elements at Oxford2004Ney, AHesjedal, TPampuch, CDas, ADaweritz, LKoch, RPloog, KTolinski, TLindner, JLenz, KBaberschke, KIn the bulk the structural and magnetic phase transitions between α- and β-MnAs are coupled and proceed abruptly by first order. In heteroepitaxially constrained MnAs/GaAs(001) films, on the other hand, the two phases coexist at 10-40 °C and the magnetization decreases continuously with temperature. We present detailed magnetic measurements on MnAs/GaAs(001) in the phase transition region covering the ferromagnetic a phase, the paramagnetic β phase and the α + β coexistence region. The coexistence of two magnetically distinguishable types of α-MnAs around the onset of the coexistence region at 10 °C, the occurrence of metastable magnetic properties, and the absence of a Curie-Weiss peak in the susceptibility point to a first order of the magnetic phase transition also in thin films. The two types of α-MnAs are characterized by different coercivity and magnetic anisotropy, the latter due to a change in shape anisotropy of the striped phase. |
| spellingShingle | Ney, A Hesjedal, T Pampuch, C Das, A Daweritz, L Koch, R Ploog, K Tolinski, T Lindner, J Lenz, K Baberschke, K Nature of the magnetic and structural phase transition in MnAs/GaAs(001) |
| title | Nature of the magnetic and structural phase transition in MnAs/GaAs(001) |
| title_full | Nature of the magnetic and structural phase transition in MnAs/GaAs(001) |
| title_fullStr | Nature of the magnetic and structural phase transition in MnAs/GaAs(001) |
| title_full_unstemmed | Nature of the magnetic and structural phase transition in MnAs/GaAs(001) |
| title_short | Nature of the magnetic and structural phase transition in MnAs/GaAs(001) |
| title_sort | nature of the magnetic and structural phase transition in mnas gaas 001 |
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