Magnetic transitions in Mn2−xMxSb (M=3d metals)

We applied first-principles total-energy calculations to several compounds Mn 2¹x M x Sb (M = Ti, Cr, Co, or Cu) to calculate the total energy. The results indicate that the Ti and Cu (Cr and Co) atoms prefer the Mn(II) site to the Mn(I) site [Mn(I) to Mn(II)]. These results are consistent with experimental observations. The antiferromagnetism (AF) [ferrimagnetism (FR)] is more stable than FR (AF) upon decreasing (increasing) the distance between the Mn(II) and Sb atoms in the z direction in all Mn 2¹x M x Sb systems. This result indicates that the environment around the Mn atom plays a very important role in the stabilization of the AF state, as is the case with Mn 2 Sb 1¹x As x systems. For Mn 2¹x Co x Sb systems, the atomic disorder between the Mn and Co atoms is insensitive to the relative stability of two magnetic phases AF and FR.

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“…3) In contrast, the Cr atom prefers the Mn(I) site to the Mn(II) site, which is consistent with neutron-diffraction experiments.…”

Section: Resultssupporting

confidence: 78%

Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn2−xMxSb (M = Ti, Cr, Co, or Cu)

et al. 2015

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“…By far, most researches on the FOMTs have been concentrated on the ferromagnetic (FM) transitions, which in general could be divided into two categories: one is from the weak magnetic (paramagnetic PM or antiferromagnetic AFM) to FM state on heating, such as Ni 45.2 Mn 36.7 In 13 Co 5.1 and MnNiGe 0.915 Al 0.085 [4,6]; the other occurs from FM to PM state with the increasing temperature, such as Gd 5 (Si 2 Ge 2 ), MnNi 0.77 Fe 0. 23 Ge, MnFeP 0.45 As 0.55 , LaFe 11.4 Si 1.6 with the increasing temperature [1][2][3]5]. Considering the ferrimagnetism also belongs to strong magnetism, the magnetic transitions between FRI and AFM (or PM) state should also accompany abrupt ΔM and therefore, a large MCE would also be expected around these transitions [7].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Magnetocaloric Properties in Ferrimagnetic Mn_2−xCo_xSb ($x=0.15$ and 0.20) Alloys

et al. 2015

IEEE Trans. Magn.

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The ferrimagnetic Mn 2-x Co x Sb (x=0.15, 0.20) alloys were prepared by arc-melting technique.The structure, magnetic and magnetocaloric properties on these compounds were investigated. The tetragonal Cu 2 Sb-type structure (P4/nmm space group) was confirmed by XRD measurements at room temperature for these two alloys. The Co-introduction results in a first-order magnetic transition between the antiferromagnetic and ferrimagnetic state. Adopting the standard and loop process method, respectively, the measurements of isothermal magnetization were performed and the magnetic entropy changes were evaluated for these alloys.Index Terms-Magnetic and magnetocaloric properties, first-order magnetic transition, ferrimagnetic, Mn 2-x Co x Sb (x=0.15, 0.20) alloys

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“…Doping at either of Mn or Sb site results in first order ferrimagnetic (FRI) to antiferromagnetic (AFM) transition with lowering temperature (T N ) [2]. The magnetic structure of Mn 2 Sb consist of triple layer like Mn 1 -Mn 2 -Mn 1 arrangement where Mn 1 (2.1 µ B ) and Mn 2 (3.9 µ B ) are two different crystallographic position with antiparallel spin alignment.…”

Section: Introductionmentioning

confidence: 99%

Study of magnetic anisotropy in Co-doped Mn₂Sb

Kushwaha

Thamizhavel

Rawat

2011

J. Phys.: Conf. Ser.

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View the article online for updates and enhancements. Abstract.We have grown single crystals of Mn2−xCoxSb with x =0.20 and 0.15 . Magnetization studies show a first order ferrimagnetic to antiferromagnetic transition with lowering temperature at TN ≈ 160 K and ≈ 117 K for x = 0.20 and 0.15, respectively. TN is found to be independent of applied magnetic field (1000 Oe) direction. Besides TN , signature of a spin reorientation transition (TSR) has also been observed near room temperature for x=0.15. Below spin reorientation transition, magnetization behavior is highly anisotropic and easy direction of magnetization are different for x= 0.20 and 0.15.

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Magnetic transitions in Mn2−xMxSb (M=3d metals)

Cited by 71 publications

References 9 publications

Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn<sub>2−</sub><i><sub>x</sub></i>M<i><sub>x</sub></i>Sb (M = Ti, Cr, Co, or Cu)

Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn<sub>2−</sub><i><sub>x</sub></i>M<i><sub>x</sub></i>Sb (M = Ti, Cr, Co, or Cu)

Magnetic and Magnetocaloric Properties in Ferrimagnetic Mn_2−xCo_xSb ($x=0.15$ and 0.20) Alloys

Study of magnetic anisotropy in Co-doped Mn₂Sb

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Magnetic transitions in Mn2−xMxSb (M=3d metals)

Cited by 71 publications

References 9 publications

Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn<sub>2&minus;</sub><i><sub>x</sub></i>M<i><sub>x</sub></i>Sb (M = Ti, Cr, Co, or Cu)

Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn<sub>2&minus;</sub><i><sub>x</sub></i>M<i><sub>x</sub></i>Sb (M = Ti, Cr, Co, or Cu)

Magnetic and Magnetocaloric Properties in Ferrimagnetic Mn2−xCoxSb ($x=0.15$ and 0.20) Alloys

Study of magnetic anisotropy in Co-doped Mn2Sb

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Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn<sub>2−</sub><i><sub>x</sub></i>M<i><sub>x</sub></i>Sb (M = Ti, Cr, Co, or Cu)

Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn<sub>2−</sub><i><sub>x</sub></i>M<i><sub>x</sub></i>Sb (M = Ti, Cr, Co, or Cu)

Magnetic and Magnetocaloric Properties in Ferrimagnetic Mn_2−xCo_xSb ($x=0.15$ and 0.20) Alloys

Study of magnetic anisotropy in Co-doped Mn₂Sb