Variable-temperature micromagnetic study of epitaxially grown MnAs films on GaAs(001)

Mohanty, J.; Hesjedal, T.; Plake, T.; Kästner, M.; Däweritz, L.

doi:10.1007/s00339-003-2226-1

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…In the film, the α-and β-phases coexist over a much wider temperature range. Although this phase coexistence in MnAs films at RT has been noticed early [105], it has been only recently systematically studied experimentally by XRD [106][107][108][109][110], atomic force microscopy (AFM) [112][113][114][115][116][117][118], magnetic force microscopy (MFM) [111,117,118], x-ray magnetic circular dichroism photoemission electron microscopy (XMCDPEEM) [61,119,120], and low-energy electron microscopy (LEEM) [120]. The problem of the phase coexistence of α-and β-MnAs in epitaxial films has previously been treated theoretically [106,107], motivated by the first experimental observations by XRD and AFM.…”

Section: Strain-mediated Coexistence Of α-Mnas and β-Mnasmentioning

confidence: 98%

“…Magnetic domains can be observed using a variety of techniques [149]. The micromagnetic structure of MnAs/GaAs films has been extensively studied by MFM [117,118,134,142,143,147] and XMCDPEEM [61,119,148]. Recently a real-time study of domain reversal by means of a magneto-optical microscope magnetometer has also been reported [149].…”

Section: Imaging Of the Domain Structure By Mfm And Xmcdpeemmentioning

confidence: 99%

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Interplay of stress and magnetic properties in epitaxial MnAs films

Däweritz

2006

Rep. Prog. Phys.

126

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Studies on MnAs, and in particular of its magnetostructural phase transition, have a long history. As a promising material for ferromagnet/semiconductor hybrid structures with new challenges for solid state physics and electronic engineering, MnAs thin films recently came again into the focus of interest. This review summarizes the presently available knowledge about epitaxial growth of MnAs films in a variety of epitaxial orientations on differently oriented GaAs substrates, their interface formation, and the interrelated structural and magnetic properties. In situ growth studies using reflection-high energy electron diffraction and high-resolution x-ray diffraction as well as imaging of the growth morphology by scanning tunnelling microscopy provided a detailed understanding of the growth kinetics. The mismatch accommodation mechanisms elucidated by high-resolution transmission electron microscopy investigations explain how films of high quality can be grown despite a large and anisotropic misfit. Most extensively considered are structural and magnetic properties that are related to the strain evolution in the films during cooling after growth. In clear contrast to bulk MnAs, the structural phase transition in MnAs films exhibits a coexistence of the ferromagnetic α-phase and the paramagnetic β-phase over a wide range of temperatures and a thickness dependent thermal hysteresis. This strain-mediated phase coexistence has been studied in detail by x-ray diffraction and by imaging the magnetic structure using magnetic force microscopy and magnetic circular dichroism photoemission electron microscopy, and also theoretically. It depends in a characteristic manner on the epitaxial orientation. Using high-resolution x-ray diffraction data, it is shown that a unified mechanism explains the shift of the ferromagnetic transition temperature to higher values in as-grown MnAs films of appropriate epitaxial orientation, in MnAs films under external biaxial strain, and in MnAs clusters within a GaAs matrix. The improvement of the structural and magnetic properties of the films by a postgrowth thermal annealing process is demonstrated.The article was invited by Professor K Ploog.

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Section: Strain-mediated Coexistence Of α-Mnas and β-Mnasmentioning

confidence: 98%

Section: Imaging Of the Domain Structure By Mfm And Xmcdpeemmentioning

confidence: 99%

Interplay of stress and magnetic properties in epitaxial MnAs films

Däweritz

2006

Rep. Prog. Phys.

126

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“…The investigation of the transition mechanisms has been proposed using many different methods studying the transition either from a purely structural point of view ,− or from the corresponding magnetic states. ,,, Local techniques as high-resolution transmission electron microscopy (TEM) can hardly bring accurate structural information as the lattice parameter difference between the two phases is too small and the crystal domain boundaries do not exhibit any singular features. , Local magnetic techniques have therefore been used, such as magnetic force microscopy (MFM) − and X-ray magnetic circular dichroism photoemission electron microscopy (XMCD-PEEM). , Viewed from the film surface plane, the FM α-MnAs and N-FM β-MnAs phases coexist in a form of self-aligned array of stripes between around 20 and 50 °C, , and the width of α-MnAs stripes is continuously tunable by varying the temperature. ,, …”

Section: Methodsmentioning

confidence: 99%

In Depth Spatially Inhomogeneous Phase Transition in Epitaxial MnAs Film on GaAs(001)

Gatel

Serin

et al. 2017

Nano Lett.

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Abstract. Most studies on MnAs material in its bulk form have been focused on its temperature dependent structural phase transition accompanied by a magnetic one.Magnetostructural phase transition parameters in thin MnAs films grown on GaAs substrate present however some differences from the bulk behavior, and local studies become mandatory for a deeper understanding of the mechanisms involved within the transition. Up to now, only surface techniques have been carried on, while the transition is a three dimensional phenomenon. We therefore developed an original nanometer scale methodology using electron holography to investigate the phase transition in an epitaxial MnAs thin film on GaAs(001) from the cross-section view. Using quantitative magnetic maps recorded at the nanometer scale as function of the temperature, our work provides a direct in situ observation of the inhomogeneous spatial distribution of the transition in the layer depth and brings new insights on the fundamental transition mechanisms.

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“…In MnAs thin films with Bloch walls, the image contrast pattern similar to the one obtained in ND-C was observed by other research groups. 26 Therefore, it is highly possible that ND-C and ND-D exhibit Bloch and Néel walls, respectively. Subsequently, we estimated the domain wall widths of ND-C and ND-D from the contrast patterns, or contrast distributions, of the MFM images shown in Fig.…”

Section: B Magnetic Domain and Domain Wall Characterizations Of Mnasmentioning

confidence: 99%

Magnetic domain structure and domain wall analysis of ferromagnetic MnAs nanodisks selectively-grown on Si (111) substrates for spintronic applications

Horiguchi

Hara

Iida

2018

Journal of Applied Physics

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We report on the experimental and analytic results on magnetic domain and domain wall structures of MnAs nanodisks on AlGaAs nanopillar buffers selectively grown on Si (111) substrates partially covered with dielectric SiO2 thin film mask patterns using selective-area metal-organic vapor phase epitaxy. The results on the size dependence of the magnetic domain structure in MnAs nanodisks investigated by magnetic force microscopy show that a single domain is predominant in the MnAs nanodisks with an area of approximately 3 × 104 nm2 or less. It is also indicated that in the nanodisks with an area of approximately 6 × 104 nm2 or more, multiple domains, in particular, two magnetic domain structures with a 180° domain wall, are predominant. In addition, in the case of nanodisks with multiple domains, not only Néel walls but also Bloch walls are possibly formed, according to the detailed analyses of the magnetic force microscope images obtained. These results suggest that the magnetic domains and domain walls can be tuned by the control of the MnAs nanodisk size making them interesting nanostructures for spintronic applications.

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Variable-temperature micromagnetic study of epitaxially grown MnAs films on GaAs(001)

Cited by 8 publications

References 7 publications

Interplay of stress and magnetic properties in epitaxial MnAs films

Interplay of stress and magnetic properties in epitaxial MnAs films

In Depth Spatially Inhomogeneous Phase Transition in Epitaxial MnAs Film on GaAs(001)

Magnetic domain structure and domain wall analysis of ferromagnetic MnAs nanodisks selectively-grown on Si (111) substrates for spintronic applications

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