Magnetic critical behavior of Mn5Ge3 ribbons

Zheng, Tiantian; Shi, Yangguang; Li, J. B.; Fan, Jiyu; Shi, Dongqi; Lv, L. Y.; Tang, Shaolong

doi:10.1002/pssb.201248474

Cited by 7 publications

(3 citation statements)

References 30 publications

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“…For materials undergoing a second-order phase transition, a critical exponent analysis in the vicinity of the transition is usually employed to illustrate the details of the magnetic interaction responsible for the transition [8][9][10][11] . The critical exponents characterizing the critical behavior are normally determined through the modified Arrott plots [12] and the Kouvel-Fisher method [13] .…”

Section: Introductionmentioning

confidence: 99%

Critical Behavior of Gd5Si2Ge1.9Ga0.1 near the Ferromagnetic-Paramagnetic Phase Transition

Zhao

Wang

Zhang

2013

AMR

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The critical behavior near the ferromagnetic-paramagnetic phase transition in Gd5Si2Ge1.9Ga0.1 has been investigated using a method based on the field dependence of isothermal entropy change. The reliability of the critical exponents determined in such a way has been examined through various techniques, like constructing the modified Arrott plot, applying the scaling law on the isothermal magnetization curves, and comparing the values with those obtained from the Kouvel-Fisher model. The resulting values of the exponents were estimated to be = 0.45(2), = 1.31(5), = 3.9(2) and = 0.69(1), close to the values predicted by the mean field theory. Hence, we concluded that the exchange interaction is of long-range type.

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Section: Introductionmentioning

confidence: 99%

Critical Behavior of Gd5Si2Ge1.9Ga0.1 near the Ferromagnetic-Paramagnetic Phase Transition

Zhao

Wang

Zhang

2013

AMR

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“…[ 4,14,15 ] Considering the fascinating nature of the Y–Ni system, it is essential to investigate the nature of the magnetic phase transition occurring at

T_{normalC}

. We have presented an analysis of the critical behaviour near

T_{normalC}

[ 16–22 ] for the

x = 0.5

sample. The scaling hypothesis postulates that a second‐order magnetic phase transition near

T_{normalC}

is characterized by a set of critical exponents, namely, β , γ , and δ , which are respectively associated with the spontaneous magnetization (

M_{normalS}

), initial susceptibility (

χ_{0} = \lim_{H \to 0} M / H

), and magnetization isotherm (

M - H

).…”

Section: Critical Analysismentioning

confidence: 99%

The Emergence of an Itinerant Ferromagnetic State in Co‐Doped YNi₅: A Critical Behavior Study of the Phase Transition

Karmakar

Giri

Majumdar

2020

Physica Status Solidi (b)

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YNi5 is an enhanced Pauli paramagnetic material, and this work is devoted to the effect of Co doping at the Ni site of YNi5. It is found that at 10% Co doping, the sample turns ferromagnetic, with a weak itinerant character. The critical behaviours of the 10% Co‐doped sample (i.e., YNi4.5CO0.5) in its polycrystalline form are examined through bulk magnetization measurements. The second‐order phase transition from the paramagnetic to the ferromagnetic state is confirmed by the positive slope of the Arrott plots. To obtain the most reliable values of the critical exponents, an extensive analysis of the magnetization data is performed, which includes a modified Arrott plot, Kouvel–Fisher plot, and critical isotherm analysis. The best values of the exponent obtained are β = 0.179 (±0.002), γ = 1.429 (±0.002), and TC = 9.1 K. These values are close to a 2D Ising model along with the long‐range exchange decaying as J(r) ≈ r−(3.6). It is found that this extended exchange is a typical characteristic of many itinerant ferromagnets, whereas the 2D nature is likely to be connected with the layered crystal structure.

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“…In addition, it is believed that the coexistence of AFM and FM coupling observed at low temperature may lead to the low-temperature noncollinear spin configuration which is commonly observed in Mn 5 Ge 3 thin film or nanowire [20,22,23,27]. Mn 5 Ge 3 has been widely studied for its magnetocaloric properties due to the large effect near room temperature, which makes it a potential candidate for magnetic refrigeration with the advantage of being environment friendly [28][29][30][31]. Though the magnetothermal properties of Mn 5 Ge 3 have been extensively investigated, further studies are desired to understand the intrinsic magnetic interactions, especially the critical behavior in Mn 5 Ge 3 single crystal.…”

Section: Introductionmentioning

confidence: 99%

Critical behavior in the Mn$_{5}$Ge$_{3}$ ferromagnet

Lin¹,

Wang²,

Xu³

et al. 2022

Preprint

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High-Curie-temperature ferromagnets are promising candidates for designing new spintronic devices. Here we have successfully synthesized a single-crystal sample of the itinerant ferromagnet Mn5Ge3 used flux method and its critical properties were investigated by means of bulk dc-magnetization at the boundary between the ferromagnetic (FM) and paramagnetic (PM) phase. Critical exponents β = 0.336 ± 0.001 with a critical temperature Tc = 300.29 ± 0.01 K and γ = 1.193 ± 0.003 with Tc = 300.15 ± 0.05 K are obtained by the modified Arrott plot, whereas δ = 4.61 ± 0.03 is deduced by a critical isotherm analysis at Tc = 300 K. The self-consistency and reliability of these critical exponents are verified by the Widom scaling law and the scaling equations. Further analysis reveals that the spin coupling in Mn5Ge3 exhibits three-dimensional Ising-like behavior. The magnetic exchange is found to decay as J(r) ≈ r −4.855 and the spin interactions are extended beyond the nearest neighbors, which may be related to different set of Mn-Mn interactions with unequal magnitude of exchange strengths. Additionally, the existence of noncollinear spin configurations in Mn5Ge3 results in a small deviation of obtained critical exponents from those for standard 3D-Ising model.

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Magnetic critical behavior of Mn₅Ge₃ ribbons

Cited by 7 publications

References 30 publications

Critical Behavior of Gd<sub>5</sub>Si<sub>2</sub>Ge<sub>1.9</sub>Ga<sub>0.1</sub> near the Ferromagnetic-Paramagnetic Phase Transition

Critical Behavior of Gd<sub>5</sub>Si<sub>2</sub>Ge<sub>1.9</sub>Ga<sub>0.1</sub> near the Ferromagnetic-Paramagnetic Phase Transition

The Emergence of an Itinerant Ferromagnetic State in Co‐Doped YNi₅: A Critical Behavior Study of the Phase Transition

Critical behavior in the Mn$_{5}$Ge$_{3}$ ferromagnet

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Magnetic critical behavior of Mn5Ge3 ribbons

Cited by 7 publications

References 30 publications

Critical Behavior of Gd<sub>5</sub>Si<sub>2</sub>Ge<sub>1.9</sub>Ga<sub>0.1</sub> near the Ferromagnetic-Paramagnetic Phase Transition

Critical Behavior of Gd<sub>5</sub>Si<sub>2</sub>Ge<sub>1.9</sub>Ga<sub>0.1</sub> near the Ferromagnetic-Paramagnetic Phase Transition

The Emergence of an Itinerant Ferromagnetic State in Co‐Doped YNi5: A Critical Behavior Study of the Phase Transition

Critical behavior in the Mn$_{5}$Ge$_{3}$ ferromagnet

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Product

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Magnetic critical behavior of Mn₅Ge₃ ribbons

The Emergence of an Itinerant Ferromagnetic State in Co‐Doped YNi₅: A Critical Behavior Study of the Phase Transition