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Journal ArticleDOI

Effect of Mn on the Magnetic and Electrical Properties of Ho $scriptstyle_0.85$ Tb $scriptstyle_0.15$ Fe $scriptstyle_2$

25 Sep 2006-IEEE Transactions on Magnetics (IEEE)-Vol. 42, Iss: 10, pp 3117-3119
TL;DR: Magnetic and electrical transport studies have been carried out on Ho0.85Tb0.15Fe2-xMnx[x=0-2] in the temperature range 5-300 K as discussed by the authors.
Abstract: Magnetic and electrical transport studies have been carried out on Ho0.85Tb0.15Fe2-xMnx[x=0-2] in the temperature range 5-300 K. The saturation magnetization at 5 K is found to increase with increasing Mn content due to the absence of Mn moments. The temperature variation of magnetization reveals several spin reorientation transitions and these are compared with the ac susceptibility results. Electrical resistivity reveals the dominance of electron magnon scattering at low temperatures and electron-phonon scattering at high temperatures
Citations
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Journal ArticleDOI
TL;DR: The microstructure of the alloys investigated consists of three phases viz. RFe 2 as major phase, RFe 3 and R-rich phases as minor phases as mentioned in this paper.
Abstract: Alloys of Ho 1− x Tb x Fe 1.95 ( x =0, 0.15, 0.25, 0.5, 0.75 and 1) were prepared and investigated for structural and magnetic properties. The microstructure of the alloys investigated consists of three phases viz. RFe 2 as major phase, RFe 3 and R-rich as minor phases. The RFe 3 phase, however, appears in minimum volume fraction for concentrations up to x

11 citations

References
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Journal ArticleDOI
K.N.R. Taylor1
TL;DR: The physical properties of many of the rare-earth intermetallic compounds have been discussed in terms of the role that the magnetic exchange and crystal field interactions play in determining these properties.
Abstract: The physical properties of many of the rare-earth intermetallic compounds have been collected together. They are discussed in terms of the role that the magnetic exchange and crystal field interactions play in determining these properties. It is pointed out that in this vast number of materials there is an ideal chance of establishing which of several second-order terms are effective in determining structural stability.

405 citations


"Effect of Mn on the Magnetic and El..." refers background in this paper

  • ...RARE earth transition compounds of the RT (R: rare earth, T: 3d transition metal) find extensive application as magnetostrictive materials [1], [2]....

    [...]

Book ChapterDOI
TL;DR: In this article, a general treatment of magnetostriction for the cases of hexagonal and cubic symmetry is described, which is applicable to the rare earth elements and rare earth-iron compounds and the role of intrinsic as well as extrinsic effects.
Abstract: Publisher Summary This chapter provides an overview of the magnetoelastic properties of the highly magnetostrictive rare earth-Fe2 alloys. The chapter describes a general treatment of magnetostriction for the cases of hexagonal and cubic symmetry, which is applicable to the rare earth elements and the rare earth-iron compounds. The chapter presents the magnetostriction of binary rare earth-iron alloys and the magnetostriction of single crystal and polycrystal RFe2 compounds are compared to other magnetostrictive materials at room temperature. The chapter discusses a possible source of startling magnetostriction anisotropy, measurements of magnetization, sublattice magnetization, and magnetic anisotropy, and the role of intrinsic as well as extrinsic effects. It reports the effects of the strong magnetoelastic coupling on sound velocities and elastic moduli and observes extraordinarily large ∆E effects and changes in sound velocity in single crystals, polycrystals, and amorphous rare earth-Fe2 alloys. The chapter concludes with a discussion of the recent measurements of linear and volume magnetostriction on the amorphous form of the RFe2 alloys.

319 citations

Book ChapterDOI
01 Jan 1988
TL;DR: Legvold et al. as discussed by the authors measured the basal plane magnetostrictions of Tb and Dy at low temperatures, which are 100 to 10000 times typical magnetostrains and still remain the largest known (~1%).
Abstract: By the early 1960’s, it was widely recognized that the rare earths possessed many extraordinary magnetic properties. Neutron diffraction measurements, for example, showed that the spin structures were much more complex than those of any of the classical ferromagnets or antiferromagnets. More importantly, in the heavy rare earth metals, the parallel coupling of large orbital and large spin angular momenta yielded huge magnetic moments of 9μ B and 10μ B, dwarfing the conventional values of 0.6 for Ni and 2.2 for Fe. Enormous magnetic anisotropies were also encountered in the heavy rare earth elements. In 1963, a breakthrough in magnetostrictive materials occurred with the measurement of the basal plane magnetostrictions of Tb and Dy at low temperatures (Legvold et al. 1963, Clark et al. 1963, 1965, Rhyne and Legvold 1965). These basal plane strains are 100 to 10000 times typical magnetostrictions and still remain today the largest known (~1%). Over wide temperature ranges, thermal expansions are dominated by the temperature dependences of the magnetostrains. Elastic moduli were found to be strongly influenced by the unprecedented magnetoelastic interactions. However, because of the low ordering temperatures of the rare earths the application of these magnetostrictive properties to devices operating at room temperature could not be achieved with the elements. Only Gd, which is essentially non-magnetostrictive, possesses a Curie point as high as room temperature.

240 citations


"Effect of Mn on the Magnetic and El..." refers background in this paper

  • ...RARE earth transition compounds of the RT (R: rare earth, T: 3d transition metal) find extensive application as magnetostrictive materials [1], [2]....

    [...]

Journal ArticleDOI
Isao Mannari1
TL;DR: In this article, the authors used a model for ferromagnets such that the electrical current is carried by 4s (or 6s) electrons which are assumed to be described in band scheme and the unpaired electrons (3d or 4J) are localized on the lattice points.
Abstract: We use a model for ferromagnets such that the electrical current is carried by 4s (or 6s) electrons which are assumed to be described in band scheme and the unpaired electrons (3d or 4J) are assumed to be localized on the lattice points. In the temperature region far below the Curie point the spin-disorder in spin orientation, which can be naturally described in terms of spin waves, gives rise to the scattering of conduction electrons through the s-d interaction and accordingly contributes to the anomalous part of the resistivity of type 1'2, which agrees fairly well with the experimental results both in order of magnitude and in temperature dependence. The effects of the lattice vibration are also discussed and turn out to give only the small additional contribution of type 1'5.

169 citations

Journal ArticleDOI
Motoki Shiga1
TL;DR: In this paper, the conditions for the onset of Mn moments and the type of spin fluctuations of the Mn sublattice are discussed, and it is shown that the Mn moments, if they exist, are unstable and easily collapse on raising the temperature or on substituting R or Mn by a third element with a smaller atomic volume.
Abstract: The magnetism of Laves phase compounds RMn2 is reviewed. The conditions for the onset of Mn moments and the type of spin fluctuations of the Mn sublattice are discussed. It is shown that the Mn moments, if they exist, are unstable and easily collapse on raising the temperature or on substituting R or Mn by a third element with a smaller atomic volume. By analyzing the thermal expansion curves, the amplitudes of spin fluctuations in YMn2 and related compounds are estimated.

126 citations


"Effect of Mn on the Magnetic and El..." refers background in this paper

  • ...The compounds with Fe, Co, and Ni crystallize in C15 type cubic Laves phase structure while RMn crystallizes in the C15 type cubic Laves phase structure for R Gd, Tb, Dy, Ho, and Y and in the hexagonal C14 type Laves phase structure for R Pr, Nd, Er, Tm, and Lu [3]....

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