Observation of domain wall pinning in Dy/sub 0.73/Tb/sub 0.27/Fe/sub 2-x/Ni/sub x/ and Ho/sub 0.85/Tb/sub 0.15/Fe/sub 2-y/Ni/sub y/ systems
TL;DR: In this paper, the magnetization process is influenced by the domain wall pinning and the value of the propagation field observed increases with Ni concentration in both the systems up to x=y=1.5 and falls to a small value for x =y=2.0.
Abstract: Magnetization studies were carried out on the cubic Laves phase Dy/sub 0.73/Tb/sub 0.27/Fe/sub 2-x/Ni/sub x/ and Ho/sub 0.85/Tb/sub 0.15/Fe/sub 2-y/Ni/sub y/ [x=y=0, 0.5, 1.0, 1.5 and 2.0] systems at 4.2 K. These studies indicate that the magnetization process is influenced by the domain wall pinning. The value of the propagation field observed increases with Ni concentration in both the systems up to x=y=1.5 and falls to a small value for x=y=2.0. The pinning effect is more pronounced in the case of Dy/sub 0.73/Tb/sub 0.27/Fe/sub 2-x/Ni/sub x/ when compared with Ho/sub 0.85/Tb/sub 0.15/Fe/sub 2-y/Ni/sub y/ because of the larger K/sub 1/ value for Dy/sub 0.73/Tb/sub 0.27/Fe/sub 2/ compared to Ho/sub 0.85/Tb/sub 0.15/Fe/sub 2/.
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TL;DR: X-ray diffraction carried out on random and oriented samples of Pr3(Fe1−xCox)27.5Ti1.5 showed that the easy magnetization direction is near the b axis for x=0, 0.2, and 0.3 as discussed by the authors.
Abstract: X-ray diffraction carried out on random and oriented samples of Pr3(Fe1−xCox)27.5Ti1.5 (x=0, 0.1, 0.2, 0.3) showed that the easy magnetization direction is near the b axis for x=0, 0.2, and 0.3 and is almost along the b axis for x=0.1. Magnetic hysteresis data taken on oriented samples showed that the anisotropy field (HA) varies from 12 kOe for x=0 to 25 kOe for x=0.3 at 300 K. At 10 K, HA increases from 55 kOe for x=0.1 to 70 kOe for x=0.3. An indication of spin reorientation transition has been observed at ∼250 K in x=0.3.
23 citations
TL;DR: In this paper, the magnetic properties of ball-milled TbFe2 and Tb Fe2B were studied by magnetization measurements and it was found that boron occupied interstitial position in the crystal structure, just as hydrogen did.
Abstract: The magnetic properties of ball-milled TbFe2 and TbFe2B were studied by magnetization measurements. X-ray diffraction studies on TbFe2B showed that boron occupied interstitial position in the crystal structure, just as hydrogen did. The value of the saturation magnetization of TbFe2B was found to be smaller than that of TbFe2. This is explained on the basis of a charge transfer between the boron atoms and the 3d band of Fe. The anisotropy of TbFe2B was found to be large compared to that of TbFe2. X-ray diffractograms for the ball milled samples showed that after 80 h of milling, a predominantly amorphous phase was obtained. TbFe2B was found to undergo easy amorphization compared to TbFe2. Magnetization of TbFe2 was found to decrease rapidly with initial milling hours and was found to be constant with further hours of milling. TbFe2B exhibited an anomalous behaviour with an increase in moment with milling hours and this may be due to the segregation of α-Fe.
21 citations
Cites background from "Observation of domain wall pinning ..."
...27Fe2 and Ho0⋅85Tb0⋅15Fe2 have revealed domain wall pinning (Senthil Kumar et al 1995)....
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TL;DR: In this article, the effect of Tb/Dy ratio on the structural and magnetic properties of (Tb,Dy)Fe2 class of alloys has been investigated using nine alloys of tbxDy1−xFe1.
18 citations
TL;DR: The structural, electrical and magnetic properties of Dy0.73Tb0.27Fe2−xMnx [ x = 0, 0.25, 0.5 and 1] have been investigated through X-ray diffraction studies and magnetization, Curie temperature and electrical resistivity measurements as mentioned in this paper.
13 citations
TL;DR: In this paper, the magnetostriction improved remarkably with the individual addition of Nb and Zr, and it is seen from the microstructural features that Nb addition results in the formation of (Tb,Dy)Fe3 phase owing to the substitution of Zr for rare earths in the main phase.
13 citations
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TL;DR: A survey of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and 3D transition elements is given in this article.Apart from binary compounds, the results of pseudobinary series are also considered.
Abstract: A survey is given of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and 3d transition elements. Apart from binary compounds the results of pseudobinary series are also considered. The magnetic properties determined by the exchange interactions involving 4f as well as 3d electrons, are discussed together with experimental results available on magnetovolume effects and various resonance techniques such as NMR and the Mossbauer effect.
1,189 citations
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
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
TL;DR: In this paper, the authors used the Moessbaurr effect in 57Fe to determine the direction of magnetization in the HoxTb1-xFe2, HoxEr 1-x Fe2, Dy/sub x/Tb 1-XFe2, DyxE1-exFe2/, and Hox Tm1-oxFe2 systems as a function of x and temperature.
Abstract: Directions of the easy magnetization in the HoxTb1-xFe2 , HoxEr1-x Fe2, Dy/sub x/Tb1-xFe2, DyxE1-xFe2/, and Hox Tm1-xFe2 systems were determined as a function of x and temperature by means of the Moessbaurr effect in 57Fe. If the direction of magnetization of each system is described by a (x,T) spin-- orientation diagram, it is found that the (x,T) plane is divided into two or three regions, in each of which the direction of magnetization is along a different major crystal axis. Theoretical calculations based on the assumption that the magnetic crystalline anistropy is due to the anisotropy of the interaction between the 4f electrons of the rare-earth ions with the crystal fields reproduced the general features of the experimental results though small discrepancies remained. Taking into account an additional contribution to the anisotropy attributed to the Fe -- Fe interaction improved the agreement between the theoretical and experimental spin-orientation diagrams. From the theoretical fits to the experimental results a value of (--0.038 plus or minus parameters A6/A4. The transitions between the regions of the spin--orientation diagrams are not sharp. Possible reasons for the existence of the transition regions are discussed. (9 figures, 3 tables, 15 references) (auth)
155 citations
TL;DR: In this article, the authors review the fundamental magnetic and magnetostrictive properties of the RFe 2 Laves phases, focusing especially on the complex behavior of the anisotropy and the success of crystal field theory in explaining it.
151 citations