Three-dimensional critical behavior and anisotropic magnetic entropy change in quasi-two-dimensional 
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Yang, Xiukang; Pan, Junxiao; Gai, Wei‐Zhuo; Tao, Yaping; Jia, Hong; Cao, Leiming; Cao, Yan

doi:10.1103/physrevb.105.024419

Cited by 8 publications

(2 citation statements)

References 77 publications

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“…A peak presents around T C in all the plots of −ΔS M (T, H) vs T, and these peaks expand asymmetrically on both sides with an increasing applied magnetic field, exhibiting typical behavior of FM systems. In addition, the position of the peaks gradually transfer to higher temperatures with an increasing of applied magnetic fields, which eliminates the mean-field model [79][80][81], consistent with the above analyses on critical behavior. −ΔS M (T, H) reaches to a maximal value of 1.18 J kg −1 K −1 at μ 0 H = 5 T, the value is comparable with that of typical systems with a second-order FM transition [51,82,83].…”

Section: Magnetic Entropy Changesupporting

confidence: 79%

Critical behavior and magnetic entropy change of skyrmion host Co₇Zn₈Mn₅

Yang

Pan

et al. 2022

New J. Phys.

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The magnetic properties of a β-Mn-type alloy Co7Zn8Mn5, which is a chiral magnet hosting skyrmion phase, are comprehensively investigated, exhibiting a ferromagnetic transition around 184 K and a spin freezing near 20 K. The generated Rhodes-Wolfarth ratio (RWR) equals 1.10, which indicates a weak itinerant character of the ferromagnetism in Co7Zn8Mn5. The spin dynamics of the spin freezing agrees with the universal scaling law of critical slowing down with τ0 = 1.7 × 10−5 s, Tg = 20.2 K, and zν = 3.92. Critical exponents β = 0.423(1) and γ = 1.366(4) are deduced by the modified Arrott plot, whereas δ = 4.22(2) is obtained by a critical isotherm analysis. The validity of the deduced critical exponents is verified by the Widom scaling relation and the scaling hypothesis. The boundary between the first-order and the second-order phase transition is evaluated by a scaling analysis. The magnetic interaction, obtained by a renormalization group theory, decays with distance r as J(r) ≈ r−4.9 , lying between the mean-field model and the 3D Heisenberg model. The analyses on critical behavior could shed new light on the origin of ferromagnetism and topological Hall effect. Moreover, the magnetic entropy change −∆SM exhibits a maximal value around TC , and the peak position gradually raises with an increasing fields, eliminating the mean-field model. The −∆SM max features a power-law behavior with n > 2/3, excluding any universal standard models of ferromagnetism. The −∆SM(T,H) plots can be scaled into a universal curve, further verifying the reliability and accuracy of the yielded critical exponents.

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Section: Magnetic Entropy Changesupporting

confidence: 79%

Critical behavior and magnetic entropy change of skyrmion host Co₇Zn₈Mn₅

Yang

Pan

et al. 2022

New J. Phys.

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“…Among the commonly followed methodologies of magnetic characterization, the analysis of critical exponents is of special interest. Critical exponents derived using scaling relations help in providing information about magnetic interaction, origin of the spin dimensionality, the correlation length, and the spatial decay of the correlation function near the T C [13,14]. The critical exponents β, γ, and δ depend upon the symmetry, the dimensionality of the order parameter, and the space, etc [15,16].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and electrical transport studies of polycrystalline Sr₁₋ _x Bi _x Fe₁₂O₁₉ (x = 0, 0.01, and 0.02)

Sahoo

Barik

Kuila

et al. 2022

J. Phys. D: Appl. Phys.

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Bismuth (Bi) substituted strontium hexaferrite, Sr1-xBixFe12O19; for x = 0, 0.01 and 0.02 are studied via powder neutron diffraction (ND), magnetization (M) studies, Mössbauer spectroscopy and electrical transport. ND results show an indication of increasing Fe2+ at 12k crystallographic sites (and is supported by Mössbauer results), with increasing Bi in the sample. It also suggests increase in strain due to Bi substitution for the polyhedral associated with 2a and 2b spin-up and 4f1 spin-down sites. Magnetization measurements in a wide temperature range (3 – 823 K), shows irreversibility in zero field cooled (ZFC) and field cooled (FC) data right below the Curie temperature, along with the Hopkinson peak in the ZFC data. Temperature dependence of saturation magnetization follows the Bloch relation but that of coercive field shows an unconventional behavior. The coercive field data is fitted using an equation devised by taking into consideration of all the three anisotropies. The critical exponents at the ferromagnetic-paramagnetic phase transition boundary are calculated using modified Arrott plots, are slightly overvalued as per mean-field theory. Temperature dependence of resistivity displays nearest-neighbor hopping conduction in all the three samples. The conductivity increases with increasing Bi in the sample, due to the increasing Fe2+ content, which facilitates the electron hopping between Fe-sites. The magnetoresistance measured at various sub-room temperatures for all the compounds shows the interplay of anisotropy magnetoresistance (AMR) and giant magnetoresistance (GMR). Low temperature data are dominated by GMR and gradual participation of AMR increases as room temperature is approached.

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