Magnetic anisotropy of Sm2Fe17−xGax hydrides

1993 ◽  
Vol 71 (11-12) ◽  
pp. 574-577 ◽  
Author(s):  
R. A. Dunlap ◽  
Z. Wang
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Room Temperature ◽  
Single Phase ◽  
Easy Axis ◽  
Phase 2 ◽  
Planar Anisotropy ◽  
Uniaxial Magnetic Anisotropy ◽  
Diffusion Of Hydrogen ◽  
Hard Magnetic Properties

The magnetic properties of single-phase 2:17 compounds of the composition Sm2Fe17−xGaxHy were investigated. The substitution of Ga for Fe in the Sm2Fe17 compound resulted in a substantial increase in the Curie temperature and, for alloys with x > 2, the formation of a uniaxial magnetic anisotropy at room temperature. The diffusion of hydrogen into those compounds that exhibit an easy axis anisotropy causes a transition back to a planar anisotropy. This indicates that the presence of interstitial hydrogen is detrimental to the hard magnetic properties of these materials.

Easy Axis Spin-Flop in ε-Phase In-Doped Iron (III) Oxide Nanowires

2015 ◽  
Vol 233-234 ◽  
pp. 558-561
Author(s):  
A.I. Dmitriev ◽  
O.V. Koplak ◽  
Asuka Namai ◽  
Hiroko Tokoro ◽  
Shinichi Ohkoshi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Room Temperature ◽  
Easy Axis ◽  
Sharp Decrease ◽  
Oxide Nanowires ◽  
Spin Flop Transition ◽  
Ε Phase

This work reports study of magnetic properties of the ε-In0.24Fe1.76O3 nanowires possessing 6 kOe coercive force at room temperature. Freezing of the sample below 190 K causes sharp decrease of the coercive force and magnetization of nanowires driven by the easy axis spin-flop transition.

scholarly journals Ferromagnetic Order in the Intermetallic Alloys laNi5-xMgx

2012 ◽  
Vol 29 (1) ◽  
pp. 50
Author(s):  
D.N Ba ◽  
L.T Tai ◽  
N.T Trung ◽  
N.T Huy
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Room Temperature ◽  
Single Phase ◽  
Chemical Doping ◽  
Intermetallic Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ferromagnetic Order ◽  
Diffraction Patterns

The influences of the substitution of Ni with Mg on crystallographic and magnetic properties of the intermetallic alloys LaNi5-xMgx (x ≤ 0.4) were investigated. The X-ray diffraction patterns showed that all samples were of single phase, and the lattice parameters, a and c, decreased slightly upon chemical doping. LaNi5 is well known as an exchange-enhanced Pauli paramagnet. Interestingly, in LaNi5-xMgx, the ferromagnetic order existed even with a small amount of dopants; the Curie temperature reached the value of room temperature for x = 0.2, and enhanced with increasing x.

Magnetic properties of thin hard/soft-stacked dot arrays with a large uniaxial magnetic anisotropy

2009 ◽  
Vol 105 (7) ◽  
pp. 07C103 ◽  
Author(s):  
K. Mitsuzuka ◽  
T. Shimatsu ◽  
N. Kikuchi ◽  
O. Kitakami ◽  
H. Muraoka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Uniaxial Magnetic Anisotropy

Coligand effects on the architectures and magnetic properties of octahedral cobalt(ii) complexes with easy-axis magnetic anisotropy

CrystEngComm ◽  
2020 ◽  
Vol 22 (13) ◽  
pp. 2297-2303 ◽  
Author(s):  
Yuewei Wu ◽  
Jing Xi ◽  
Jinhui Yang ◽  
Weiming Song ◽  
Shuchang Luo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Easy Axis

Coligand effects lead to two mononuclear octahedral Co(ii) complexes exhibiting easy-axis magnetic anisotropies and distinct magnetic properties.

A tetragonal phase Mn2B2 sheet: a stable room temperature ferromagnet with sizable magnetic anisotropy

2020 ◽  
Vol 22 (19) ◽  
pp. 10893-10899 ◽  
Author(s):  
Yusuf Zuntu Abdullahi ◽  
Zeynep Demir Vatansever ◽  
Ethem Aktürk ◽  
Ümit Akıncı ◽  
Olcay Üzengi Aktürk
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Electronic Devices ◽  
Two Dimensional ◽  
Metal Boride

Exploring the magnetic properties of two-dimensional (2D) metal boride (MBene) sheets for spin-based electronics is gaining importance for developing electronic devices.

Synthesis and Magnetic Properties of Co Nanorod Superlattices

2006 ◽  
Vol 962 ◽  
Author(s):  
Fabienne Wetz ◽  
Katerina Soulantica ◽  
Marc Respaud ◽  
Andrea Falqui ◽  
Bruno Chaudret
Keyword(s):  
Thermal Decomposition ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Magnetic Recording ◽  
Coercive Field ◽  
Shape Control ◽  
Room Temperature ◽  
High Density ◽  
High Density Magnetic Recording ◽  
Long Chain

ABSTRACTWe present the synthesis and magnetic properties of Co nanorods spontaneously organized in superlattices over a surface of several microns. This material results from the thermal decomposition of a cobalt precursor under hydrogen, in the presence of a long-chain amine and a long-chain acid as shape control agents. These nanorod superlattices are ferromagnetic at room temperature and they are characterized by a strong coercive field as a consequence of their large magnetic anisotropy. This system can be considered as a good candidate for high density magnetic recording.

Soft Magnetic Property of [Fe80Ni20-O/ZnO]n Multilayer Thin Films for High-Frequency Application

2012 ◽  
Vol 476-478 ◽  
pp. 2335-2338 ◽  
Author(s):  
Yuan Wang ◽  
Hao Geng ◽  
Shuang Jun Nie ◽  
Jian Qing Wei ◽  
Lai Sen Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Easy Axis ◽  
Magnetic Measurement ◽  
Soft Magnetic Property ◽  
Multilayer Thin Films ◽  
Soft Magnetic ◽  
Uniaxial Magnetic Anisotropy ◽  
Glass Substrates ◽  
Measurement Results

A series of [Fe80Ni20-O/ZnO]nmultilayer thin films with different ZnO separate layer thicknesses (t, from 0 to 3 nm) and fixed Fe80Ni20-O layer thickness (about 5 nm) have been fabricated on (100)-oriented silicon wafers and glass substrates by reactive magnetron sputtering. Microstructure analysis and static magnetic measurement results indicate that the magnetic properties of the films can be adjusted by the variation of ZnO monolayers thickness. All films reveal an evident in-plane uniaxial magnetic anisotropy (IPUMA). The values of in-plane uniaxial magnetic anisotropy fields (Hk) and resistivity (ρ) can be changed from 8 to 57 Oe and 62 to 168 μΩ•cm respectively with the t increasing. While the values of hard axis coercivity (Hch) and easy axis coercivity (Hce) reveal minimums of 1.5 and 3 Oe respectively at t = 1 nm.

Preparation of Strontium Ferrite Powders by Mechanochemical Process

2011 ◽  
Vol 110-116 ◽  
pp. 1736-1740 ◽  
Author(s):  
Ju Hua Luo
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Single Phase ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Starting Mixture ◽  
Ft Ir ◽  
Mechanochemical Treatments ◽  
Firing Method

Sr-ferrite powders were preparated by mechanochemical treatments using SrCO3 and Fe2O3 as raw materials. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM) were employed to evaluated the morphologies, structures and magnetic properties of samples. The results indicated that the starting mixture became amorphous stage after ball-milled for 30h, and single phase SrFe12O19 could be obtained after annealed at 900°C for 2h. And the saturation magnetization was 58.2Am2/kg, and coercivity was 281.2 kA/m at room temperature. In comparison with the traditional firing method , the mechanochemical method benefited achieving the higher coercivity, which indicated that the samples had a better magnetic properties.

scholarly journals Enhancement of Hard Magnetic Properties in Fraktal-Like Nano and Mesoscopic Grains

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1443
Author(s):  
Grzegorz Ziółkowski ◽  
Dariusz Chrobak ◽  
Grażyna Chełkowska ◽  
Ondrej Zivotsky ◽  
Artur Chrobak
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Permanent Magnets ◽  
High Surface ◽  
Volume Ratio ◽  
High Coercivity ◽  
Energy Product ◽  
Surface Development ◽  
System Nodes ◽  
Hard Magnetic Properties

The paper refers to Monte Carlo magnetic simulations for fractal-like nano and mesoscopic grains. The analyzed objects differed in the size, surface development, magnetic anisotropy and the spin values attributed to the system nodes inside the fractal. Such an approach allowed us to determine their magnetization processes as well as optimization characteristics in the direction to enhancement of hard magnetic properties. As it was shown, the size effects depend on the chosen value of magnetic anisotropy. In the case of fractals with ultra-high coercivity, the decreasing of their size leads to deterioration of coercivity, especially for the high surface to volume ratio. Opposite effects were observed for soft magnetic fractals when the nanostructure caused an appearance of the coercive field, and the maximum of energy product was predictably significantly higher than for conventional rare earths’ free permanent magnets.

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