Magnetic anisotropy and coercivity of Fe3Se4 nanostructures

Long, Gen; Zhang, Hongwang; Li, Da; Sabirianov, Renat; Zhang, Zhidong; Zeng, Hao

doi:10.1063/1.3662388

Cited by 62 publications

(71 citation statements)

References 16 publications

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“…The fitting parameter H K at 10 K is 104:560:2 kOe, which is similar to that (' 2H C ¼ 80 kOe) reported in Ref. 9.…”

Section: Sample Preparationsupporting

confidence: 72%

“…10) and 2.7 (Ref. 9), which appears inconsistent with the theories. 7,8 Here, we report magnetic hysteresis loops for ferrimagnetic iron chalcogenide Fe 3 Se 4 nanoparticles (about 30 nm).…”

Section: Introductionmentioning

confidence: 51%

“…At 10 K, the anisotropy constant is 3 ) calculated using the projector augmented-wave (PAW) method. 9 This big difference implies inaccuracy of the PAW method and an improved theoretical work is required to yield better agreement between the experimental and theoretical values.…”

Section: Sample Preparationmentioning

confidence: 99%

See 2 more Smart Citations

Temperature dependence of magnetic anisotropy constant in iron chalcogenide Fe3Se4: Excellent agreement with theories

Wang

Duan

Xiong

et al. 2012

Journal of Applied Physics

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Magnetic hysteresis loops were measured for ferrimagnetic iron chalcogenide Fe 3 Se 4 nanoparticles in the whole temperature range below the Curie temperature T C (315 K). The coercivity of the material is huge, reaching about 40 kOe at 10 K. The magnetic anisotropy constant K was determined from the magnetic hysteresis loop using the law of approach to saturation. The deduced anisotropy constant at 10 K is 5:22 Â 10 6 erg=cm 3 , which is over one order of magnitude larger than that of Fe 3 O 4 . We also demonstrated that the experimental magnetic hysteresis loop is in good agreement with the theoretical curve calculated by Stoner and Wohlfarth for a noninteracting randomly oriented uniaxial single-domain particle system. Moreover, we show that K is proportional to the cube of the saturation magnetization M s , which confirms earlier theoretical models for uniaxial magnets. V C 2012 American Institute of Physics. [http://dx

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“…The fitting parameter H K at 10 K is 104:560:2 kOe, which is similar to that (' 2H C ¼ 80 kOe) reported in Ref. 9.…”

Section: Sample Preparationsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 51%

See 1 more Smart Citation

Temperature dependence of magnetic anisotropy constant in iron chalcogenide Fe3Se4: Excellent agreement with theories

Wang

Duan

Xiong

et al. 2012

Journal of Applied Physics

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“…Although the analysis of the diffraction data may allow to assign a monoclinic structure of the inclusions, further analysis of our magnetization data are not entirely consistent since the monoclinic Fe 3 Se 4 is reported to be ferrimagnetic [40,44,45] with the magnetic transition temperature and hysteretic magnetization curve even above room temperature. Our magnetization measurements are hysteretic at low temperatures but do not indicate such a behavior for the SC sample at room temperature where only an S-shape is seen.…”

Section: 2791(17) Fe2mentioning

confidence: 66%

Structural inhomogeneities in FeTe0.6Se0.4: Relation to superconductivity

Prokeš

Schulze

Hartwig

et al. 2015

Journal of Crystal Growth

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Chemical and structural phase compositions of two single-crystalline samples prepared with different cooling rates from stoichiometric FeTe 0.6 Se 0.4 melts were studied. Both types of samples were investigated in a very comprehensive way using magnetic and electrical transport measurements combined with X-ray, neutron and electron backscatter diffraction. We show that slowly cooled samples are homogeneous on a microscopic scale with only a small excess of iron. Those slowly cooled samples do not exhibit bulk superconductivity down to 1.8 K. In contrast, fast-cooled samples are superconducting below about 14 K but are composed of several chemical phases: They consist of a matrix preserving the crystal structure of slow-cooled samples, and of core-shell structured dendritic inclusions (about 20-30 vol.%). These have different crystal structure and chemical composition and order magnetically at temperatures far above the superconducting transition temperature of the inhomogeneous samples. These structural and chemical inhomogeneities seem to play a vital role in the superconducting properties of this and similar iron-based systems as they lead to internal stress and act in a similar way as the application of the external pressure that reportedly increase the superconducting transition temperature in many iron pnictides and chalcogenides. We argue that a phase pure, homogeneous and stress-free FeTe 0.6 Se 0.4 is non-superconducting.

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“…(The use of the Fe sheath results in the introduction of Fe from the sheath to the core, and the use of the other metal sheaths results in the reaction of metal tellurides, which finally results in the increase in the amount of excess Fe in the Fe(Se,Te) core [37].) Having considered the low superconducting properties (particularly in the polycrystalline PIT wires) and high superconducting properties in single crystals [25] or coated conductors [26], we propose that the best way to achieve practical performance in the Fe-chalcogenide superconducting wires (or tapes) is growing well-connected large grains as coated conductors.…”

Section: Resultsmentioning

confidence: 99%

Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface

Izawa¹,

Tanaka²,

Mizuguchi³

et al. 2016

Jpn. J. Appl. Phys.

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We investigated the magnetization and crystal structure of FeSe polycrystalline samples with various grain sizes. For the samples with large grains, a large magnetic critical current density Jc was observed. For the samples with small grains, superconductivity signals were not observed; instead, magnetization hysteresis, which is not a result of superconductivity, was observed. In the X-ray diffraction pattern for the samples with small grains, broad additional peaks were observed, corresponding to the formation of the non-superconducting (monoclinic) Fe-Se phase at the FeSe grain surface. The crystal structure instability at the grain surface would be the reason for the low superconducting properties of the Fe-chalcogenide polycrystalline wires investigated thus far.

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Magnetic anisotropy and coercivity of Fe3Se4 nanostructures

Cited by 62 publications

References 16 publications

Temperature dependence of magnetic anisotropy constant in iron chalcogenide Fe3Se4: Excellent agreement with theories

Temperature dependence of magnetic anisotropy constant in iron chalcogenide Fe3Se4: Excellent agreement with theories

Structural inhomogeneities in FeTe0.6Se0.4: Relation to superconductivity

Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface

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