Absence of magnetic domain wall motion during magnetic field induced twin boundary motion in bulk magnetic shape memory alloys

Lai, Yiu Wai; Scheerbaum, N.; Hinz, Dietrich; Gutfleisch, Oliver; Schäfer, Rudolf; Schultz, L.; McCord, Jeffrey

doi:10.1063/1.2737934

Cited by 72 publications

(47 citation statements)

References 14 publications

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“…The fundamental pattern is a staircase domain pattern. [10][11][12] This pattern is possible due to different symmetries of the underlying ferroelastic or ferromagnetic transformation, resulting in martensitic variants or magnetic domains. While for a martensitic variant only the direction of the magnetic easy axis is important, for a magnetic domain also the direction of magnetization matters.…”

Section: Introductionmentioning

confidence: 99%

Magnetic domain pattern in hierarchically twinned epitaxial Ni–Mn–Ga films

Diestel

Neu

Backen

et al. 2013

J. Phys.: Condens. Matter

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Magnetic shape memory alloys exhibit a hierarchically twinned microstructure, which has been well examined in epitaxial Ni-Mn-Ga films. Here we analyze consequences of this "twin within twins" microstructure on the magnetic domain pattern. Atomic and magnetic force microscopy are used to probe the correlation between the martensitic microstructure and magnetic domains. We examine consequences of different twin boundary orientations with respect to the substrate normal as well as variant boundaries between differently aligned twinned laminates. A detailed micromagnetic analysis is given which describes the influence of the finite film thickness on the formation of magnetic band domains in these multiferroic materials.

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Section: Introductionmentioning

confidence: 99%

Magnetic domain pattern in hierarchically twinned epitaxial Ni–Mn–Ga films

Diestel

Neu

Backen

et al. 2013

J. Phys.: Condens. Matter

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“…[9], no statistical analysis of the stress induced AE noises was presented and only a qualitative description was given. Furthermore, in previous studies of magnetic field induced detwinning, no noise measurements were carried out, but rather the emphasis was put on the observation of the initial and/or final magnetic domain structure [24][25][26][27][28][29]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field induced random pulse trains of magnetic and acoustic noises in martensitic single-crystal Ni2MnGa

et al. 2017

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Jerky magnetic and acoustic noises were evoked in a single variant martensitic Ni 2 MnGa single crystal (produced by uniaxial compression) by application of an external magnetic field along the hard magnetization direction. It is shown that after reaching the detwinning threshold, spontaneous reorientation of martensite variants (twins) leads not only to acoustic emission but magnetic two-directional noises as well. At small magnetic fields, below the above threshold, unidirectional magnetic emission is also observed and attributed to a Barkhausen-type noise due to magnetic domain wall motions during magnetization along the hard direction. After the above first run, in cycles of decreasing and increasing magnetic field, at low-field values, weak, unidirectional Barkhausen noise is detected and attributed to the discontinuous motion of domain walls during magnetization along the easy magnetization direction. The magnetic noise is also measured by constraining the sample in the same initial variant state along the hard direction and, after the unidirectional noise (as obtained also in the first run), a two-directional noise package is developed and it is attributed to domain rotations. From the statistical analysis of the above noises, the critical exponents, characterizing the power-law behavior, are calculated and compared with each other and with the literature data. Time correlations within the magnetic as well as acoustic signals lead to a common scaled power function (with β = −1.25 exponent) for both types of signals.

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“…with easy axis along the field, exhibits the hysteresis and the coercive force about 0.002 T. The major loop exhibits only slightly higher value. It is apparent that in this case the magnetization process proceeds by nucleation and the movement of magnetic domain walls in contrast to statement in [5,12]. The small value of the hysteresis in comparison with the large magnetic anisotropy (which can be estimated from initial curve in Fig.…”

Section: Experimental Methodsmentioning

confidence: 91%

Magnetic Domain Structure and Magnetically-Induced Reorientation in Ni-Mn-Ga Magnetic Shape Memory Alloy

Heczko

Bradshaw

2017

Acta Phys. Pol. A

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Magnetization process during magnetically induced reorientation and related magnetic domains of cuboid Ni50Mn28.5Ga21.5 single crystal with {100} faces was investigated. Magnetic domains were visualized using magneto-optical indicator. The domains pattern is determined by strong uniaxial magnetic anisotropy of NiMn-Ga martensite. Thanks to magnetically induced reorientation the domains arrangements for all three crystal orientations could be obtained and we showed that the size of domains scales with square root of the thickness and penetrates through whole crystal. Visualization of magnetic domains on all faces of cuboid provides the 3D model of magnetic domains.

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Absence of magnetic domain wall motion during magnetic field induced twin boundary motion in bulk magnetic shape memory alloys

Cited by 72 publications

References 14 publications

Magnetic domain pattern in hierarchically twinned epitaxial Ni–Mn–Ga films

Magnetic domain pattern in hierarchically twinned epitaxial Ni–Mn–Ga films

Magnetic field induced random pulse trains of magnetic and acoustic noises in martensitic single-crystal Ni2MnGa

Magnetic Domain Structure and Magnetically-Induced Reorientation in Ni-Mn-Ga Magnetic Shape Memory Alloy

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