Fast domain wall dynamics in MnAs/GaAs films

Tortarolo, M.; Thevenard, L.; Bardeleben, H. J. von; Cubukcu, M.; Etgens, V. H.; Eddrief, M.; Gourdon, C.

doi:10.1063/1.4746381

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Data obtained by a temperature increase (from colder temperatures) and decrease (from hotter temperatures) are presented in blue and red, respectively. [39].…”

Section: A Measurements Of the Pristine Samplementioning

confidence: 99%

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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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“…Data obtained by a temperature increase (from colder temperatures) and decrease (from hotter temperatures) are presented in blue and red, respectively. [39].…”

Section: A Measurements Of the Pristine Samplementioning

confidence: 99%

“…As visible in figure 1, the thermal hysteresis is smaller for intense fields than for weak fields, with ∆ ≈ T 6.2-6.5 Oe. This is probably due to the more difficult propagation of the domain walls of ferromagnetic regions separated by paramagn etic regions [39].…”

Section: Measurements Of the Pristine Samplementioning

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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“…The potential of magnetic semiconductors for developing magnetocaloric 1 and spintronic [2][3][4] devices has recently spurred the research activity in MnAs films. Characterizing and understanding the magnetic configuration of MnAs mesoscopic structures have thus become an essential clue for device design.…”

Section: Introductionmentioning

confidence: 99%

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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