scholarly journals Competing anisotropy in the (TmxPr1-x)2Fe17 system

2018 ◽  
Vol 185 ◽  
pp. 04023
Author(s):  
Sergey Platonov ◽  
Anatoly Kuchin ◽  
Alexey Volegov ◽  
Alexander Korolev ◽  
Dmitriy Neznakhin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Basal Plane ◽  
Magnetic Ordering ◽  
Easy Magnetization Axis ◽  
Magnetization Curves ◽  
Critical Fields ◽  
Easy Magnetization ◽  
Hexagonal Axis ◽  
Magnetization Axis ◽  
Magnetically Aligned

The magnetization curves of magnetically aligned finely powdered samples of the (TmxPr1-x)2Fe17 compounds have been measured at 4 K. The easy magnetization axis is oriented in the basal plane or along the hexagonal axis for the compounds with x = 0-0.3 and 0.7-1, respectively. This is because of the absence of magnetic ordering in the Tm and Pr subsystems in these ranges, respectively, and because of competing anisotropy of the subsystems. For the compositions with x = 0.4-0.6, both rare-earth subsystems are magnetically ordered and the easy magnetization axis is oriented between the basal plane and the hexagonal axis. The critical fields of FOMPs decrease quickly as the Pr or Tm content decreases in the ranges 0-0.3 and 0.7-1, respectively. The magnetization anisotropy also diminishes as the Tm content becomes smaller than x = 0.7. No influence of the intrinsic microdeformations on the magnetization of the compounds was detected.

Magneto-Optical Properties of Rare-Earth Terbium Ferrite-Garnet in the Near the Temperature of the Orientation Phase Transition

2022 ◽  
Vol 1049 ◽  
pp. 186-191
Author(s):  
Mirzo Z. Sharipov ◽  
Dilshod E. Hayitov ◽  
Mirzohid N. Rizoqulov
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Rare Earth ◽  
Temperature Region ◽  
Magnetic Phase ◽  
Easy Magnetization Axis ◽  
Easy Magnetization ◽  
Ferrite Garnet ◽  
Magnetization Axis ◽  
Qualitative Level

A model of the rearrangement of the domain structure of the Tb0.2Y2.8Fe5O12 garnet ferrite in the temperature region of the spontaneous reorientation of the easy magnetization axis is proposed, which makes it possible to consistently describe (at a qualitative level) the entire set of experimental results obtained. The latter makes it possible to make a choice in favor of the fluctuation mechanism of nucleation of domains of a new magnetic phase in the process of reorientation of the direction of the easy magnetization axis.

Change in the Direction of the Easy Magnetization Axis of Arrays of Segmented Ni/Cu Nanowires with Increasing Ni Segment Length

2021 ◽  
Author(s):  
A. A. Mistonov ◽  
I. S. Dubitskiy ◽  
A. H. A. Elmekawy ◽  
E. G. Iashina ◽  
S. V. Sotnichuk ◽  
...  
Keyword(s):  
Easy Magnetization Axis ◽  
Segment Length ◽  
Easy Magnetization ◽  
Cu Nanowires ◽  
Magnetization Axis

Epitaxial Growth of Rare Earths on Rare Earth Fluorides and Rare Earth Fluorides on Rare Earths: Two New Epitaxial Systems Accessed by MBE

1987 ◽  
Vol 103 ◽  
Author(s):  
R. F. C. Farrow ◽  
S. S. P. Parkin ◽  
M. Lang ◽  
K. P. Roche
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Rare Earth Metal ◽  
Basal Plane ◽  
Earth Metal ◽  
Magnetic Ordering ◽  
Metal Films ◽  
Squid Magnetometry ◽  
New Family ◽  
Rare Earth Fluorides

ABSTRACTWe report two new epitaxial systems, prepared by MBE: basal plane epitaxy of the rare earth metal Dy onto LaF3 films and vice versa. SQUID magnetometry studies indicate that buried epitaxial Dy films, of ∼300Å thick, order ferromagnetically at similar temperatures to bulk Dy crystals.These epitaxial systems are one member of a new family of epitaxial systems of basal plane epitaxy of rare earth metals on rare earth fluorides and vice versa. Such systems may be used to probe the effects of strain and dimensionality on magnetic ordering in rare earth metal films and multilayers.

Temperature Dependence of the ΔE-Effect for Amorphous Metal Alloy Ribbons with Different Orientations of the Easy Magnetization Axis

2016 ◽  
Vol 59 (5) ◽  
pp. 612-617
Author(s):  
A. A. Gavrilyuk ◽  
A. L. Semenov ◽  
A. R. Gafarov ◽  
A. V. Gavrilyuk ◽  
N. P. Kovaleva ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Amorphous Metal ◽  
Easy Magnetization Axis ◽  
Metal Alloy ◽  
Easy Magnetization ◽  
Amorphous Metal Alloy ◽  
Magnetization Axis ◽  
Δe Effect

Structural and Magnetic Properties of Ho3Fe29-xTx (T=V and Cr) Compounds

2013 ◽  
Vol 669 ◽  
pp. 46-50
Author(s):  
Y.N. Han ◽  
X.F. Han ◽  
H.L. Liu
Keyword(s):  
Magnetic Properties ◽  
Magnetic Measurements ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
Critical Fields ◽  
Easy Magnetization ◽  
Magnetization Direction ◽  
Xrd Pattern ◽  
Magnetically Aligned ◽  
Good Agreement

The crystallographic structural characteristics and magnetic properties of Ho3Fe29-xTx (T=V and Cr) compounds have been investigated by using Rietveld refinement analysis of X-ray diffraction (XRD) pattern and magnetic measurements. The calculated results indicate that among the 11 different kinds of Fe sites in these Ho-Fe compounds the preferential sites of the stabilizing elements V and Cr are quite different. The refined lattice parameters of these compounds are in good agreement with the experimental data. Spin reorientations of easy magnetization direction (EMD) are observed at around 150 K for Ho3Fe27V2 and Ho3Fe25.5Cr3.5. At the around 1.7 T critical fields (HCR) first order magnetization process (FOMP) occurs in magnetization curves at 4.2 K for the magnetically aligned samples of Ho3Fe27V2 and Ho3Fe25.5Cr3.5.

scholarly journals Structural and magnetic characteristics of the Co/Cu/Co thin-film systems

2018 ◽  
Vol 185 ◽  
pp. 03009
Author(s):  
Elena Shalygina ◽  
Anna Kharlamova ◽  
Andrey Makarov ◽  
Galina Kurlyandskaya ◽  
Andrey Svalov
Keyword(s):  
Thin Film ◽  
Exchange Coupling ◽  
Hysteresis Loops ◽  
Easy Magnetization Axis ◽  
Magnetic Characteristics ◽  
Easy Magnetization ◽  
Saturation Field ◽  
Glass Substrates ◽  
Magnetization Axis ◽  
Ferromagnetic Layers

The results on investigation of structural and magnetic characteristics of Co/Cu/Co thin-film systems obtained by magnetron sputtering on glass substrates are presented. The thickness of Co layers in all samples is equal to 5 nm and the Cu layer is varied from 0.5 to 4 nm. It is found that the saturation field, HS, oscillates in magnitude with increasing Cu layer thickness with the period of the order of 1 nm. The maximum values of HS are observed for tCu = 1.4, 2.2 and 3.2 nm. The hysteresis loops measured for these samples in a magnetic field applied along the easy magnetization axis have a two-step form, and for other tCu – rectangular one. The obtained results are explained by the presence of exchange coupling between the ferromagnetic layers through a Co spacer and its oscillating behavior with changing tCu.

Determination of the Constants of Magnetocrystalline Anisotropy in Sintered Magnets with Uniaxial Texture

2005 ◽  
Vol 498-499 ◽  
pp. 134-140 ◽  
Author(s):  
Marcos Flavio de Campos
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Pole Figure ◽  
High Energy ◽  
Anisotropy Constant ◽  
Magnetization Curves ◽  
Easy Magnetization ◽  
Initial Magnetization ◽  
Usual Process

The usual process for producing the high energy magnets based on rare-earth-transition metals as for example NdFeB, SmCo5 or Sm(CoFeCuZr)z involves powder metallurgy. In many cases, it is necessary the determination of anisotropy constants (K1 – first order and K2 second order) from polycrystalline samples. This is not the ideal situation because for more accurate determinations a single crystal is necessary. Nevertheless, in many cases it is very difficult, or not possible, obtaining a single crystal. Then, for these situations, the anisotropy constants can be evaluated from polycrystalline samples with uniaxial texture. In this study, the methodology for making such determination is described. It includes the measurement of Schulz Pole figure by X-Ray diffraction in a surface perpendicular to the c-axis, the axis of easy magnetization. The measured Pole figure can be adjusted with a Gaussian distribution f(q)=exp(-q2/2s2) or with a distribution of type f(q) = cosn q. A model to evaluate the remanence from quantitative metallography is also described. From these distributions, and using the microstructural model, it is possible to estimate the initial magnetization curves for polycrystalline samples, including the effect of the 2nd order anisotropy constant (K2) which produces a curvature in initial magnetization curve. With all these data it is finally possible to estimate the initial magnetization curves for single crystal samples (theoretical), and the anisotropy constants K1 and K2. The inadequacy of Sucksmith-Thompson plots for determination of anisotropy constants from polycrystalline samples is also commented. The described method can be used either for rare-earth transition magnets or for Barium or Strontium ferrites.

scholarly journals Слоевые нанопроволоки --- матричный синтез, структура и магнитные свойства

2019 ◽  
Vol 61 (9) ◽  
pp. 1682
Author(s):  
Д.Л. Загорский ◽  
И.М. Долуденко ◽  
Д.А. Черкасов ◽  
О.М. Жигалина ◽  
Д.Н. Хмеленин ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Residual Magnetization ◽  
Magnetization Curves ◽  
Easy Magnetization ◽  
Force Microscopy ◽  
Shell Nanostructures ◽  
Magnetization Axis ◽  
Out Of Plane

AbstractNanowires (NWs) consisting of Ni/Cu and Co/Cu alternating layers with a diameter of 100 nm and layer thicknesses varying between 10 and 500 nm are prepared by template synthesis in pores of polymer track-etched membranes. Bath compositions and different regimes for pulsed electrodeposition of NWs are explored. A procedure for electrodeposition of NWs using pulses of equal charge is developed. By diminishing the amount of charge per pulse, initially we manage to lower the layer thickness to 10–15 nm, but further diminishing of charge in pulses leads to the blending of elemental composition of adjacent layers and/or formation of rod–shell nanostructures within the NWs. The coercive force (15–30 mT) and residual magnetization of our layered NWs are determined from magnetization measurements. For NWs with a layer thickness of 50–100 nm, the magnetization curves recorded in the out-of-plane and in-plane geometries are similar in shape and have similar parameters. For NWs with thicker layers (250 and 500 nm), magnetization curves are markedly different due to magnetic anisotropy (an easy magnetization axis emerges longitudinally to NWs) and interference between neighboring NWs. Magnetic force microscopy of isolated NWs identifies that the NWs comprise magnetic regions extending over ~100–150 nm. The NW can be partially remagnetized by applying an external magnetic field (+16 mT) longitudinally.

scholarly journals Magnetic Anisotropy Induced by Orbital Occupation States in La0.67Sr0.33MnO3 Film

2021 ◽  
Author(s):  
Huaixiang Wang ◽  
Jinghua Song ◽  
Weipeng Wang ◽  
Yuansha Chen ◽  
Xi Shen ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Film Plane ◽  
Easy Magnetization Axis ◽  
Spin Reorientation ◽  
Easy Magnetization ◽  
Lsmo Film ◽  
Electronic Spin ◽  
Magnetization Axis ◽  
Interfacial States ◽  
Orbital Occupation

Abstract Interface engineering is an effective and feasible method to regulate the magnetic anisotropy of films by altering interfacial states between different films. Using the technique of pulsed laser deposition, we prepared La0.67Sr0.33MnO3 (LSMO) and La0.67Sr0.33MnO3/SrCoO2.5 (LSMO/SCO) films on the (110)-oriented La0.3Sr0.7Al0.65Ta0.35O3 substrates. By covering the SCO film above the LSMO film, we transformed the easy magnetization axis of LSMO from the [001] axis to the [1\(\stackrel{\text{-}}{\text{1}}\)0] axis in the film plane. Based on statistical analyses, we found that the corresponding Mn-Mn ionic distances are different in the two types of LSMO films, causing different distortions of Mn-O octahedron in the LSMO film. In addition, it also induces diverse electronic occupation states in Mn3+ ions. The eg electron of Mn3+ occupies 3z2-r2 and x2-y2 orbitals in the LSMO and LSMO/SCO, respectively. We conclude that the electronic spin reorientation leads to the transformation of the easy magnetization axis in the LSMO films.

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