Magnetic studies on RCo3B2 (R=Sm, Gd, Er)

Óesterreicher, H.; Parker, F. T.; Misroch, M.

doi:10.1007/bf00915204

Cited by 61 publications

(9 citation statements)

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“…In the case of a mean-field model (i.e. β = 0.5, γ = 1 and δ = 3), we obtained n = 2/3, as predicted by Oesterreicher and Parker with rather different arguments [11]. Equation (3) was successfully tested for soft magnetic amorphous alloys [12].…”

supporting

confidence: 71%

“…The study of the field dependence of ∆S M has been usually made either experimentally [9,10], or from a theoretical point of view by using a mean-field approach [11] 1 . More recently [12], in order to predict the field dependence of ∆S M for materials which do not follow a mean-field approach, the magnetic equation of state of such a material in the proximity of the transition temperature can be approximately described by the Arrott-Noakes equation of state [13], which can be written as…”

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confidence: 99%

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Field dependence of the magnetocaloric effect in Gd and (Er _1−x Dy _x )Al ₂ : Does a universal curve exist?

et al. 2007

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-The field dependence of the magnetic entropy change of ferromagnetic lanthanidebased materials has been studied. The recently proposed master curve for the field dependence of the magnetocaloric effect of Fe-based amorphous alloys can also be constructed for these lanthanide-based crystalline materials, suggesting a universal behavior. The exponent n controlling the field dependence of the magnetic entropy change can be used for the interpretation of results in the case of multiple magnetic ordering phenomena.

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confidence: 71%

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confidence: 99%

Field dependence of the magnetocaloric effect in Gd and (Er _1−x Dy _x )Al ₂ : Does a universal curve exist?

et al. 2007

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“…However, a direct MCE or positive magnetic entropy change (ΔS M ) spread over a large operating temperature range is observed in this class of FSMAs near the SOPT. Oesterreicher et al [11] have proposed that ΔS M observed near the SOPT varies as H n (where H is the applied field) with the exponent n being related to critical exponents characterizing the (a) E-mail: asrini@iitg.ernet.in magnetic SOPT. In the case of the FeCoNiZrBCu alloy, the exponent n obtained by the power law fitting of the ΔS M (H) curve and from the critical exponents differs by nearly 20% [12].…”

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confidence: 99%

“…Figure 7 shows the ΔS M (H) data at T C,A ≈ 316.5 K and T C,M ≈ 212.5 K for the bulk polycrystalline Ni 50 Mn 35 In 14 Si 1 alloy. As pointed out earlier, the exponent n related to the field dependence of ΔS M at T C of the alloy can be obtained using the relation [11,28,29]…”

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confidence: 99%

Critical behavior and magnetic entropy change at magnetic phase transitions in Ni ₅₀ Mn ₃₅ In ₁₄ Si ₁ ferromagnetic shape memory alloy

Das¹,

Perumal²,

Srinivasan³

2014

EPL

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We have investigated critical behaviour and magnetocaloric effect in polycrystalline Ni50Mn35In14Si1 alloy near the second-order ferromagnetic phase transitions (SOPT) at austenite Curie temperature and at martensite Curie temperature by determining the critical exponents, β, γ and δ corresponding to the temperature dependence of spontaneous magnetization, initial susceptibility and isothermal magnetization, respectively. The field dependence of the maximum value of the magnetic entropy change at the two TC's was estimated using the Maxwell relation as well as from the values of the critical exponents. Values of obtained by these two methods at both the SOPT are in remarkable agreement with each other. The critical exponents have been determined by analysing isothermal magnetization data using two different methods, viz., the modified Arrott plot method and the Widom scaling relation. The scaling plots depicted on linear as well as logarithmic scales confirm the reliability of the values of critical exponents obtained. The values of the critical exponents of polycrystalline Ni50Mn35In14Si1 alloy at both the TC's are close to those predicted by mean-field theory confirming the presence of long-range magnetic ordering in the investigated alloy.

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“…They all have the hexagonal symmetry and belong to the space group of P 6 / m m m [1]. These compounds exhibit a strong axial anisotropy for R = Sm [2]. Smit et al [3] determined the crystal field parameters by measuring Mössbauer spectrum of Gdn+1Co3n+5B2n compounds.…”

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Magnetic Anisotropy and Exchange Interactions in R_n+1Co_3n+5B₂n Compounds

Kowałczyk

1994

Acta Phys. Pol. A

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The individual Co site contributions to the magnetocrystalline anisotropy in RCo5, RCo4 B and R3Co11B4 compounds have been studied. An analysis is given of the room temperature anisotropy constants of these compounds by using a model of Streever. The values of the rare earth-transition metal exchange coupling JRco/kB derived by mean field analysis of the Curie temperatures are -11.2 K, -i5 K and -20.9 K, respectively. In general, a decrease in JRco/kB with increasing Co concentration is observed.PACS numbers: 75.30.Gw, 75.30.Et IntroductionThe Rn+1CO3n+5B2n type compounds formed between rare earth (R), cobalt and boron are an important and physically interesting class of materials. Compounds in this series are known to exist for n = O (RCo5), n = 1 (RCo4B), n = 2 (R3Co11B4), n = 3 (R2Co7B3) and for n -f co (RCo3B2). These structures are based on the well-known CaCu5 structure. The unit cells are formed by alternative stacking of one layer of RCo5 and n layers of RCo3B 2 unit cells. They all have the hexagonal symmetry and belong to the space group of P 6 / m m m [1]. These compounds exhibit a strong axial anisotropy for R = Sm [2]. Smit et al. [3] determined the crystal field parameters by measuring Mössbauer spectrum of Gdn+1Co3n+5B2n compounds. The strength of the individual contributions to the magnetic anisotropy and magnetic moments of the non-equivalent Co sites in these compounds was studied using nuclear magnetic resonance (NMR) [4,5] and neutron diffraction [6].In the present investigation, the results of magnetocrystalline anisotropy and exchange interactions study of the RCo5, RCo4B and R3Co11B4 compounds are presented. A model proposed by Streever [4] is used to analyse the room temperature anisotropy constants of these compounds.

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Magnetic studies on RCo3B2 (R=Sm, Gd, Er)

Cited by 61 publications

References 14 publications

Field dependence of the magnetocaloric effect in Gd and (Er _1−x Dy _x )Al ₂ : Does a universal curve exist?

Field dependence of the magnetocaloric effect in Gd and (Er _1−x Dy _x )Al ₂ : Does a universal curve exist?

Critical behavior and magnetic entropy change at magnetic phase transitions in Ni ₅₀ Mn ₃₅ In ₁₄ Si ₁ ferromagnetic shape memory alloy

Magnetic Anisotropy and Exchange Interactions in R_n+1Co_3n+5B₂n Compounds

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Magnetic studies on RCo3B2 (R=Sm, Gd, Er)

Cited by 61 publications

References 14 publications

Field dependence of the magnetocaloric effect in Gd and (Er 1−x Dy x )Al 2 : Does a universal curve exist?

Field dependence of the magnetocaloric effect in Gd and (Er 1−x Dy x )Al 2 : Does a universal curve exist?

Critical behavior and magnetic entropy change at magnetic phase transitions in Ni 50 Mn 35 In 14 Si 1 ferromagnetic shape memory alloy

Magnetic Anisotropy and Exchange Interactions in Rn+1Co3n+5B2n Compounds

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Field dependence of the magnetocaloric effect in Gd and (Er _1−x Dy _x )Al ₂ : Does a universal curve exist?

Field dependence of the magnetocaloric effect in Gd and (Er _1−x Dy _x )Al ₂ : Does a universal curve exist?

Critical behavior and magnetic entropy change at magnetic phase transitions in Ni ₅₀ Mn ₃₅ In ₁₄ Si ₁ ferromagnetic shape memory alloy

Magnetic Anisotropy and Exchange Interactions in R_n+1Co_3n+5B₂n Compounds