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.

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.

Magnetic Properties and Magnetostriction of R2Fe17H3±x (R = Tb, Dy) Hydrides

2015 ◽  
Vol 233-234 ◽  
pp. 259-262
Author(s):  
I.S. Tereshina ◽  
Evgeniya A. Tereshina ◽  
Mathias Doerr ◽  
Ivan A. Pelevin ◽  
Inna V. Telegina ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Magnetic Anisotropy ◽  
Entire Range ◽  
Easy Axis ◽  
Spin Reorientation ◽  
Small Deviations ◽  
Ambient Temperatures ◽  
Spin Reorientation Transition ◽  
Ordered State

The magnetic anisotropy (MA) of trihydrides of single-crystalline rare-earth (R) intermetallics R2Fe17H3±x (R = Tb and Dy) with small deviations in the hydrogen concentration (x = 0 – 0.4) was investigated via the magnetic and magnetoelastic measurements in a wide temperature region. The easy-axis MA of Tb2Fe17H3±x is preserved in the entire range of magnetically ordered state while an “easy-cone – easy-plane” transition takes place in Dy2Fe17H3±x above ambient temperatures. The trihydrides demonstrate a significant decrease of magnetic anisotropy as the temperature increases. The temperature variation of thermal expansion of Dy2Fe17H3 displays anomalies in the vicinity of a spin-reorientation transition. The longitudinal magnetostriction λ||(T) of the same compound changes its sign at 340 K. The compounds studied can find specific applications in practice.

scholarly journals Preparation and Magnetic Properties of CoFe2O4 Oriented Fiber Arrays by Electrospinning

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3860
Author(s):  
Chen Cheng ◽  
Jianfeng Dai ◽  
Zengpeng Li ◽  
Wei Feng
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Hysteresis Loop ◽  
Magnetic Materials ◽  
Magnetic Moment ◽  
Easy Axis ◽  
Great Influence ◽  
Hysteresis Loops ◽  
Strong Anisotropy ◽  
Fiber Arrays

The morphology of magnetic materials has a great influence on the properties, which is attributed to the magnetic anisotropy of the materials. Therefore, it is worth studying the fabrication of the aligned fiber and the change of its domain distribution. Nanoparticles and nanofibers were prepared by the hydrothermal and electrospinning methods, respectively. At the same time, the arranged nanofibers were collected by the drum collecting device. After the same annealing at 700 °C, it was found that the diameter of fibers collected by different collecting drums is similar. By studying the hysteresis loops of nanoarrays, it was found that they had strong anisotropy. The easy axis was parallel to the long axis, the Hc and Mr of the easy axis and the hard axis were 1330.5 Oe, 32.39 Am2/kg, and 857.2 Oe, 24.8 Am2/kg, respectively. Due to the anisotropy of the shape and the interaction between the particles, the Hc could not be enhanced. Therefore, the Ms and Hc of the nanoparticles were 80.23 Am2/kg and 979.3 Oe, respectively. The hysteresis loop and the change of magnetic moment during the demagnetization of the CoFe2O4 nanofiber array were simulated via micromagnetic software. The simulated Hc was 1480 Oe, which was similar to the experimental value.

Nanocrystalline Soft Magnetic Fe-, Co-Based Alloys Doped by Hf, Mo and Zr with Enhanced Thermal Stability of Magnetic Properties

2014 ◽  
Vol 215 ◽  
pp. 196-199
Author(s):  
Anatolii P. Potapov ◽  
Natalia V. Dmitrieva ◽  
Vera A. Lukshina ◽  
Elena G. Volkova ◽  
Boris N. Filippov
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Easy Axis ◽  
Subsequent Annealing ◽  
Soft Magnetic ◽  
Different Temperatures ◽  
Thermal Stability Of

Magnetic properties, thermal stability and structure of the alloys - (Fe0.6Co0.4)86Hf7B6Cu1 (1), (Fe0.7Co0.3)88Hf7B4Cu1 (2) and (Fe0.7Co0.3)88Hf4Mo2Zr1B4Cu1 (3) obtained in the form of ribbons quenched from the melt were investigated after their nanocrystallization in the course of the thermal (TA) and stress (SA) annealings in the air at different temperatures. In all three alloys SA resulted in the induction of magnetic anisotropy with an easy axis along the direction of the ribbon. It is established that the alloy 3 after SA at 620°C for 20 min has the best thermal stability of magnetic properties, which remained practically unchanged after the subsequent annealing at 550°C for 26 hours. Magnetic properties of the alloys 1 and 2 subjected to SA under the same conditions did not change after annealing at 500°C.

Multiscale Magnetic Anisotropy in Amorphous Ferromagnetic Ribbon: An Example of FeCuNdSiB Alloy

2020 ◽  
Vol 312 ◽  
pp. 275-280
Author(s):  
Nikita Ilin ◽  
Sergey Komogortsev ◽  
Vitaliy Ivanov ◽  
Galina S. Kraynova ◽  
Alexander Davydenko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloy ◽  
Magnetic Anisotropy ◽  
Hysteresis Loop ◽  
Domain Structure ◽  
Easy Axis ◽  
Anisotropy Constant ◽  
Rolling Axis ◽  
Magnetic Anisotropy Constant ◽  
Amorphous Ribbons

An understanding of the magnetic properties in an amorphous alloy requires comprehensive studies of magnetic anisotropy at various scales. In this paper such a study is carried out using amorphous ribbons FeCuNbSiB. The magnetic anisotropy associated with the rolling axis of ribbons does not affect hysteresis loop measurements, but the disappearance of a fingerprint-like pattern in the domain structure occurs in different fields when they are applied along and transverse the rolling axis. A correlation between the local magnetic anisotropy constant and the nanoscale within which the local easy axis is ordered was found.

Dynamics and magnetic properties of NO molecules encapsulated in open-cage fullerene derivatives evidenced by low temperature heat capacity

2021 ◽  
Author(s):  
Yoji Horii ◽  
Hal Suzuki ◽  
Yuji Miyazaki ◽  
Motohiro Nakano ◽  
Shota Hasegawa ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Magnetic Properties ◽  
Low Temperature ◽  
Magnetic Anisotropy ◽  
Fullerene Derivatives ◽  
Molecular Cages ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity

Heat capacity analyses revealed dynamics and magnetic anisotropy of NO molecules confined in molecular cages.

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.

Ni thickness influence on magnetic properties (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy

2017 ◽  
Vol 441 ◽  
pp. 585-589 ◽  
Author(s):  
R. Sbiaa ◽  
I.A. Al-Omari ◽  
M. Al Bahri ◽  
P.R. Kharel ◽  
M. Ranjbar ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy

Magnetic Anisotropy in Electrodeposited CO Films and spin-valves on Gaas Substrates

1999 ◽  
Vol 562 ◽  
Author(s):  
K. Attenborough ◽  
M. Cerisier ◽  
H. Boeve ◽  
J. De Boeck ◽  
G. Borghs ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Buffer Layer ◽  
Structural Properties ◽  
Easy Axis ◽  
Spin Valve ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cu Films ◽  
Gaas Substrates ◽  
Unique Spin

ABSTRACTWe have studied the magnetic and structural properties of thin electrodeposited Co and Cu layers grown directly onto (100) n-GaAs and have investigated the influence of a buffer layer. A dominant fourfold anisotropy with a uniaxial contribution is observed in 10 nm Co electrodeposited films on GaAs. An easy axis is observed in the [001] GaAs direction with two hard axes of differing coercivities parallel to the [011] and [011] directions. For thicker films the easy axes in the [001] direction becomes less pronounced and the fourfold anisotropy becomes less dominant. Co films of similar thicknesses deposited onto an electrodeposited Cu buffer layer were nearly isotropic. From X-ray diffraction 21 nm Co layers on GaAs were found to be hcp with the c-axis tending to be in the plane of the film. The anisotropy is ascribed to the Co/GaAs interface and is held responsible for the unique spin-valve properties seen recently in electrodeposited Co/Cu films.

Effect of Thickness on Mechanically Tunable Magnetic Anisotropy of FeGa Thin Films Deposited on Flexible Substrates

2015 ◽  
Vol 815 ◽  
pp. 227-232 ◽  
Author(s):  
Ying Yu ◽  
Shu Hong Xie ◽  
Qing Feng Zhan
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Effective Strain ◽  
Anisotropy Field ◽  
Saturation Field ◽  
Effective Anisotropy ◽  
Magnetostriction Constant ◽  
The Difference ◽  
Different Strains

A practical way to manipulate the magnetic anisotropy of magnetostrictive FeGa thin films grown on flexible polyethylene terephthalate (PET) substrates is introduced in this study. The effect of film thickness on magnetic properties and magnetostriction constant of polycrystalline FeGa thin films was investigated. The anisotropy field Hk of flexible FeGa films, i.e., the saturation field determined by fitting the hysteresis curves measured along the hard axis, was enhanced with increasing the tensile strain applied along the easy axis of the thin films, but this enhancement via strain became unconspicuous with increasing the thickness of FeGa films. In order to study the magnetic sensitivity of thin films responding to the external stress, we applied different strains on these films and measure the corresponding anisotropy field. Moreover, the effective magnetostriction constant of FeGa films was calculated from the changes of both anisotropy field and external strain based on the Villari effect. A Neel’s phenomenological model was developed to illustrate that the effective anisotropy field of FeGa thin films was contributed from both the constant volume term and the inverse thickness dependent surface term. Therefore, the magnetic properties for the volume and surface of FeGa thin films were different, which has been verified in this work by using vibrating sample magnetometer (VSM) and magneto-optic Kerr effect (MOKE) system. The anisotropy field contributed by the surface of FeGa film and obtained by MOKE is smaller than that contributed by the film volume and measured by VSM. We ascribed the difference in Hk to the relaxation of the effective strain applied on the films with increasing the thickness of films.

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