Grain-size-dependent magnetic properties of nanocrystalline Gd

Kruk, Robert; Ghafari, M.; Hahn, Horst; Michels, D.; Birringer, R.; Krill, Carl E.; Kmieć, R.; Marszałek, M.

doi:10.1103/physrevb.73.054420

Cited by 24 publications

(20 citation statements)

References 36 publications

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“…Compared to P1(60~100 μm), the M S of P6(1~3 μm) reduces by 37%, which can be understood considering two aspects. One is the possible change of occupations of magnetic atoms caused by the introduced defects during the process of pulverization20. Another is the notable increase of the fraction of hexagonal phase that lost the martensitic transformation, noting the hexagonal phase may have a smaller magnetic moment than the orthorhombic phase in the Fe-doped MnNiGe with the conversion from AFM to FM16, similar to the case in MnCoGe-based alloys23.…”

Section: Resultsmentioning

confidence: 97%

“…Moreover, Kruk et al . studied grain-size-dependent magnetic properties in nanocrystalline Gd20, the well-known elemental metal showing large MCE due to second-order magnetic transition, and found that the magnetic and electronic structure of the atoms in the grain boundaries differs distinctively from that in the grain interiors. This work demonstrated the notable effect of the introduced defects on the structure and magnetic properties.…”

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confidence: 99%

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Critical dependence of magnetostructural coupling and magnetocaloric effect on particle size in Mn-Fe-Ni-Ge compounds

Shen

et al. 2016

Sci Rep

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Magnetostructural coupling, which is the coincidence of crystallographic and magnetic transition, has obtained intense attention for its abundant magnetoresponse effects and promising technological applications, such as solid-state refrigeration, magnetic actuators and sensors. The hexagonal Ni2In-type compounds have attracted much attraction due to the strong magnetostructural coupling and the resulted giant negative thermal expansion and magnetocaloric effect. However, the as-prepared samples are quite brittle and naturally collapse into powders. Here, we report the effect of particle size on the magnetostructural coupling and magnetocaloric effect in the Ni2In-type Mn-Fe-Ni-Ge compound, which undergoes a large lattice change across the transformation from paramagnetic austenite to ferromagnetic martensite. The disappearance of martensitic transformation in a large amount of austenitic phase with reducing particle size, to our best knowledge, has not been reported up to now. The ratio can be as high as 40.6% when the MnNi0.8Fe0.2Ge bulk was broken into particles in the size range of 5~15 μm. Meanwhile, the remained magnetostructural transition gets wider and the magnetic hysteresis becomes smaller. As a result, the entropy change drops, but the effective cooling power RCeffe increases and attains to the maximum at particles in the range of 20~40 μm. These observations provide constructive information and highly benefit practical applications for this class of novel magnetoresponse materials.

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Section: Resultsmentioning

confidence: 97%

mentioning

confidence: 99%

Critical dependence of magnetostructural coupling and magnetocaloric effect on particle size in Mn-Fe-Ni-Ge compounds

Shen

et al. 2016

Sci Rep

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“…Such systems are an ideal test bed for exploring and illuminating the effects of reducing structural dimensions to the nanoscale regime. Indeed, there have been several recent studies of nanostructured Gd, including magnetization [10][11][12], ac susceptibility [11,13], scanning calorimetry [10,12,13], Mossbauer spectroscopy [14] and small-angle neutron scattering [15]. These investigations have found, among other things, that: T C decreases with decreasing grain size; there is significant spin misalignment and induced magnetic anisotropy within the nanograins due to the spin disorder present in the surrounding grain boundaries; and reduced conduction-electron concentration at the grain boundaries.…”

Section: Introductionmentioning

confidence: 97%

Critical properties of the paramagnetic-to-ferromagnetic transition in nanocrystalline Gd diluted with Fe

Shand

Bohnet

Jensen

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…The influence of reduced dimensionality in Gd on its magnetic properties has been reported. [3][4][5][6][7][8] However, studies of full dense bulk nanocrystalline Gd materials are rare. This is because of the great difficulty in properly controlling the size of Gd crystal grains by common consolidation processes such as conventional sintering, or hot pressing, etc.…”

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confidence: 99%

Preparation, microstructure, and magnetic properties of bulk nanocrystalline Gd metal

Yue

Zhang

Zeng

et al. 2006

Applied Physics Letters

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Bulk nanocrystalline gadolinium metal was prepared using spark plasma sintering (SPS) and subsequent annealing process. The SPS Gd metal had a single phase with a mean grain size of about 10nm. A pressure-induced C-axis crystal texture was found in the SPS Gd sample. With the decrease of Gd grains from micrometer to nanometer range, the Curie temperature TC decreased by 10.7K and the magnetic moment per Gd atom at 5K dropped noticeably from 7.81μB to 6.31μB. These results indicate the remarkable influence of the nanostructure on the magnetism of Gd due to the finite size effect.

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Grain-size-dependent magnetic properties of nanocrystalline Gd

Cited by 24 publications

References 36 publications

Critical dependence of magnetostructural coupling and magnetocaloric effect on particle size in Mn-Fe-Ni-Ge compounds

Critical dependence of magnetostructural coupling and magnetocaloric effect on particle size in Mn-Fe-Ni-Ge compounds

Critical properties of the paramagnetic-to-ferromagnetic transition in nanocrystalline Gd diluted with Fe

Preparation, microstructure, and magnetic properties of bulk nanocrystalline Gd metal

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