Thickness-dependent magnetic domain change in epitaxial MnAs films on GaAs(001)

Ryu, Kwang-Su; Kim, JinBae; Lee, YoungPak; Akinaga, H.; Manago, Takashi; Viswan, Ravindranath; Shin, Sung‐Chul

doi:10.1063/1.2402235

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…Figure presents some magnetic phase images recorded during the heating and cooling process of area A. It is worth noticing that the incident electron beam is parallel to the MnAs[0001] magnetic hard axis, which is parallel to the length direction of α- and β-stripes and perpendicular to the [112̅0] magnetic easy axis, so that the cross sections of both α- and β-stripes are visible. As already illustrated in Figure b, FM contrasts corresponding to α-domains present phase shift variations inside the MnAs layer giving isophase lines parallel to the magnetic induction while β-domains correspond to area without such lines, that is, where there is no magnetization.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…The lamella was then thinned down to 80 nm along the MnAs[0001] axis. The MnAs ⌊112̅0⌋ easy axis , was therefore kept in the lamella plane. The details of the conventional TEM images and diffraction pattern are summarized in Supporting Information (SI).…”

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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“…8, the a/b period should be k e ¼ 144 nm and the height of the FM ridges h ¼ 0.3 nm for t ¼ 30 nm films. Moreover, an earlier work 28,29 showed that the long-range order of a/b stripes along the films is lost for films thinner than 50 nm, and only bunches of short stripes are observed by MFM in saturated MnAs films. Hence, this lack of long-range order could explain the difficulty of observing any feature of the a/b stripes array in XPEEM images of Sw PA(PE) -30 ribbons.…”

Section: B Temperature Dependence Of the Sample Magnetization And Fementioning

confidence: 93%

Combined effects of vertical and lateral confinement on the magnetic properties of MnAs micro and nano-ribbons

Steren

Tortarolo

Baldis

et al. 2016

Journal of Applied Physics

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The micromagnetic domain structure of MnAs films gave place to an intense research activity in the last few years due to its potential application in magneto-electronic devices such as domain-wall track memories and logic circuits. These applications require a full knowledge of miniaturization effects on the magnetic properties of the material. In this work, X-ray photoemission electron microscopy has been used for imaging magnetic domains in lithographically fabricated MnAs ribbons, addressing the dependence of the domain configuration on film thickness and ribbon width. Our experiments show a transition from head-on to regular stripe domains below a critical width/thickness ratio w c % 6. Micromagnetic simulations suggest that this transition is correlated to the magnetic structure of the surface plane. Depending on the ribbon width and thickness, the magnetic configuration is shown to evolve from flux-closure domain structure to a state of almost homogeneous magnetization, observed for narrower ribbons. The evolution of the domain structure, magnetic fraction, and magnetization with temperature has been studied across the ferromagnetic/paramagnetic transition. Our experiments show that the magnetic configuration in ribbons exhibits higher stability to temperature variations than in as-cast films. Published by AIP Publishing.

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“…In the past years, many studies have been dedicated to the characterization of epitaxial MnAs films [4,[8][9][10][11][12][13][14][15][16][17]. In particular, magnetic force microscopy (MFM) appeared to be a very useful tool to study the local magnetic properties as a function of different parameters such as: growing conditions [18,19], film thickness [20][21][22], temperature [23][24][25][26], applied magnetic field [27,28] and more recently, applied magnetic field and temperature at the same time [29]. In addition to the above investigations based on the out-of-plane magnetic leak field detection, measurement of the in-plane magnetic component imaging has been obtained on cleavage edges [30].…”

Section: Introductionmentioning

confidence: 99%

Low energy Ne ion beam induced-modifications of magnetic properties in MnAs thin films

Trassinelli

Carlsson

Cervera

et al. 2016

J. Phys.: Condens. Matter

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Investigations of the complex behavior of the magnetization of manganese arsenide thin films due to defects induced by irradiation of slow heavy ions are presented. In addition to the thermal hysteresis suppression already highlighted in Trassinelli et al (2014 Appl. Phys. Lett. 104 081906), we report here on new local magnetic features recorded by a magnetic force microscope at different temperatures close to the characteristic sample phase transition. Complementary measurements of the global magnetization in different conditions (applied magnetic field and temperatures) enable the film characterization to be completed. The obtained results suggest that the ion bombardment produces regions where the local mechanical constraints are significantly different from the average, promoting the local presence of magneto-structural phases far from the equilibrium. These regions could be responsible for the thermal hysteresis suppression previously reported, irradiation-induced defects acting as seeds in the phase transition.

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Thickness-dependent magnetic domain change in epitaxial MnAs films on GaAs(001)

Cited by 15 publications

References 20 publications

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

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

Combined effects of vertical and lateral confinement on the magnetic properties of MnAs micro and nano-ribbons

Low energy Ne ion beam induced-modifications of magnetic properties in MnAs thin films

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