scholarly journals Manganese segregation on defects of a crystall lattice GaSb

2020 ◽  
Vol 12 (3) ◽  
pp. 341-348
Author(s):  
Vladimir P. Sanygin ◽  
◽  
Olga N. Pashkova ◽  
Alexander D. Izotov ◽  
◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Magnetic Anisotropy ◽  
Gallium Antimonide ◽  
Magnetic Semiconductor ◽  
Ferromagnetic Phase ◽  
Soft Magnetic ◽  
Crystalline Anisotropy ◽  
Periodic Spacing

When doping gallium antimonide with 2 at.% Mn, it was found that, as a result of quenching of the melt, manganese segregates on grain-forming dislocations of the crystalline GaSb (111) texture in the form of microinclusions based on the ferromagnetic compound MnSb. Manganese atoms segregate on GaSb dislocations discretely with periodic spacing of inclusions from each other. The dimensions of the inclusions are of the order of 1 μm, they differ in composition and magnetic properties, but on average their composition and properties correspond to the ferromagnetic phase Mn1,1Sb. At T = 4 K, the crystalline anisotropy of GaSb <Mn> is accompanied by magnetic anisotropy; at T = 300 K, spherical clusters of a magnetic semiconductor retain the properties of a soft magnetic ferromagnet with a coercive force Hc ≈ 10 E.

scholarly journals The effect of magneto-crystalline anisotropy on the properties of hard and soft magnetic ferrite nanoparticles

2019 ◽  
Vol 10 ◽  
pp. 1348-1359 ◽  
Author(s):  
Hajar Jalili ◽  
Bagher Aslibeiki ◽  
Ali Ghotbi Varzaneh ◽  
Volodymyr A Chernenko
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Magnetic Behavior ◽  
Soft Magnetic ◽  
Interparticle Interactions ◽  
Co Doping ◽  
Heat Efficiency ◽  
Crystalline Anisotropy ◽  
Structure Morphology ◽  
Magneto Crystalline Anisotropy

Recent advances in the field of magnetic materials emphasize that the development of new and useful magnetic nanoparticles (NPs) requires an accurate and fundamental understanding of their collective magnetic behavior. Studies show that the magnetic properties are strongly affected by the magnetic anisotropy of NPs and by interparticle interactions that are the result of the collective magnetic behavior of NPs. Here we study these effects in more detail. For this purpose, we prepared Co x Fe3− x O4 NPs, with x = 0–1 in steps of 0.2, from soft magnetic (Fe3O4) to hard magnetic (CoFe2O4) ferrite, with a significant variation of the magnetic anisotropy. The phase purity and the formation of crystalline NPs with a spinel structure were confirmed through Rietveld refinement. The effect of Co doping on structure, morphology and magnetic properties of Co x Fe3− x O4 samples was investigated. In particular, we examined the interparticle interactions in the samples by δm graphs and Henkel plots that have not been reported before in literature. Finally, we studied the hyperthermia properties and observed that the heat efficiency of soft Fe3O4 is about 4 times larger than that of hard CoFe2O4 ferrite, which was attributed to the high coercive field of samples compared with the external field amplitude.

Effects of Heat Treatment Conditions on Magnetic Properties and Structural Features of Nanocrystalline Fe79Zr10N11 Films

2009 ◽  
Vol 152-153 ◽  
pp. 70-74 ◽  
Author(s):  
E.N. Sheftel ◽  
Rauf S. Iskhakov ◽  
S.V. Komogortsev ◽  
P.K. Sidorenko ◽  
Nikolai S. Perov
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Structural Features ◽  
Soft Magnetic ◽  
Exchange Correlation ◽  
Calculation Technique ◽  
Treatment Conditions ◽  
Random Magnetic Anisotropy ◽  
Anisotropy Model

Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocrystalline Fe79Zr10N11 films were obtained using a calculation technique in frame of the random magnetic anisotropy model. The calculations are performed using approach magnetization to saturation curves. The local magnetic anisotropy fields (Ha), and magnetic anisotropy correlation radii (Rс) reduced to =(A/K)1/2 were determined for the films annealed at 475 and 6000 C for 0.5, 1, 2, and 3 h. The correlation Hc ~(Rc/)3 for the all annealed films was found.

Effects of the Co-Presence of Conflicting Magnetic Anisotropy in Ba Ferrite Particles

2010 ◽  
Vol 67 ◽  
pp. 108-112
Author(s):  
Giancarlo Bottoni
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Low Temperatures ◽  
Magnetocrystalline Anisotropy ◽  
Shape Anisotropy ◽  
Recording Media ◽  
Magnetization Switching ◽  
Crystalline Anisotropy ◽  
Thermal Stability Of

In Ba ferrite particles magnetocrystalline and shape anisotropies are contemporarily present and conflicting. The strength and evolution of the two anisotropies are studied, through the dependence of the anisotropy constants on temperature. While in pure Ba ferrite particles the anisotropy is uniaxial at all temperatures, since the magnetocrystalline anisotropy clearly prevails on shape anisotropy, in particles modified for employment in recording media the two anisotropies are comparable and at low temperatures the shape anisotropy result stronger than the crystalline anisotropy. Besides the irregular shape of the particles introduces further preferred directions for the magnetization. The Co/Ti-doped particles show a multiple axes anisotropy. The macroscopic magnetic properties are found in relationship with the evolution of the anisotropy. Also the influence that the presence of such multiple anisotropy has on the magnetization switching and on the thermal stability of the magnetization of the Ba ferrite particles is analyzed.

Soft Magnetic Properties and Magnetic Anisotropy Dispersions of Fe–Ni/Ni–Fe Multilayered Films

1989 ◽  
Vol 28 (Part 1, No. 3) ◽  
pp. 368-371 ◽  
Author(s):  
Ryoichi Nakatani ◽  
Toshio Kobayashi ◽  
Shigekazu Ootomo ◽  
Noriyuki Kumasaka
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Multilayered Films

Magnetic Behavior and Structure of Electrodeposited, Mechanically Hard Fe-C and Fe-Ni-C Alloys

2000 ◽  
Vol 614 ◽  
Author(s):  
A. S. M. A. Haseeb ◽  
Y. Hayashi ◽  
M. Masuda
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Magnetic Behavior ◽  
Iron Film ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Mechanical Hardness ◽  
High Temperature Heat Treatment ◽  
Potential Applications ◽  
Temperature Heat Treatment

ABSTRACTIron-carbon based hard, martensitic alloys are usually produced by conventional high temperature heat treatment. In the present work, the galvanostatic electrodeposition method has been employed to obtain hard Fe-0.96 mass % C and Fe-15.4 mass% Ni-0.70 mass% C alloys at around room temperature. The alloys have been investigated by SEM, XPS, XRD, and microhardness measurements, and their magnetic properties have been studied by vibrating sample magnetometer.The as-deposited alloys were found to possess high mechanical hardness, 750-810 HV. Both alloys exhibit a smoother surface morphology as compared to a non-alloyed iron film obtained under similar electrochemical conditions. The coercive force of the as-deposited Fe-C and Fe-Ni-C alloys is 3930 and 494 A.m−1respectively. In comparison, pure iron film deposited under similar conditions possesses a coercive force of 1592 A.m−1. The Fe-Ni-C alloy has a combination of high mechanical hardness and relatively soft magnetic properties, which may be of interest in potential applications requiring both soft magnetic properties and improved tribological performance. The effects of annealing on the behavior of the alloys are discussed.

scholarly journals Optimization of magnetic properties and GMI effect of Thin Co-rich Microwires for GMI Microsensors

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1558 ◽  
Author(s):  
Lorena Gonzalez-Legarreta ◽  
Paula Corte-Leon ◽  
Valentina Zhukova ◽  
Mihail Ipatov ◽  
Juan Maria Blanco ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Hysteresis Loops ◽  
Transverse Magnetic ◽  
Wide Frequency Range ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Annealing Temperatures ◽  
High Annealing

Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect improvement was achieved either by annealing or stress-annealing. Annealed Co-rich presents rectangular hysteresis loops. However, an improvement in magnetoimpedance ratio is observed at fairly high annealing temperatures over a wide frequency range. Application of stress during annealing at moderate values of annealing temperatures and stress allows for a remarkable decrease in coercivity and increase in squareness ratio and further giant magnetoimpedance effect improvement. Stress-annealing, carried out at sufficiently high temperatures and/or stress allowed induction of transverse magnetic anisotropy, as well as magnetoimpedance effect improvement. Enhanced magnetoimpedance ratio values for annealed and stress-annealed samples and frequency dependence of the magnetoimpedance are discussed in terms of the radial distribution of the magnetic anisotropy. Accordingly, we demonstrated that the giant magnetoimpedance effect of Co-rich microwires can be tailored by controlling the magnetic anisotropy of Co-rich microwires, using appropriate thermal treatment.

Effects of Order-Disorder Reactions on the Magnetic Properties of Rapidly Quenched Fe-6.5% Si Alloy

2014 ◽  
Vol 802 ◽  
pp. 530-534
Author(s):  
F.A. Nascimento ◽  
M.C.A. da Silva
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Domain Structure ◽  
Power Loss ◽  
Magnetic Measurement ◽  
Annealing Treatment ◽  
Antiphase Domain ◽  
Spray Forming ◽  
Soft Magnetic ◽  
Treatment Conditions

Deposits of the Fe-6.5wt%Si alloy rapidly quenched by spray forming were investigated. The order phase can be either B2 or DO3 depending on annealing treatment conditions. The observation of pairs dislocations indicates the presence of super dislocations and B2 antiphase boundaries (APBs) which affects significantly the soft magnetic properties. The dislocations bound the APBS which yield δ fringes when image 200 superlattice reflections. Samples treated at 700oC for 1 h were oil quenched, this has induced a decreasing of power loss and the TEM micrographs have showed developed 1⁄4 <111> antiphase domain structure in the B2 phase. The magnetic properties were: power loss of 1.59 W/kg and coercive force of 76 A/m, at B=1 T, f=60 Hz. The samples annealed at 1250°C for 1h showed the same interaction between the APBs but better power losses on their magnetic properties. The magnetic properties were: 1.30 W/kg power loss and 40 A/m coercive force, at same conditions described above. This suggests a strong interaction between magnetic properties and antiphase domain structure in the B2 ordered phase. Optical microscopy observations corroborate the magnetic measurement conclusions.

Microstructures and Magnetic Properties of Sputtered Expitaxial Co3Pt/Pt Multilayer Films

2008 ◽  
Vol 47-50 ◽  
pp. 583-587
Author(s):  
S.C. Chen ◽  
Po Cheng Kuo ◽  
Chih Long Shen ◽  
Y.H. Fang ◽  
S.L. Hsu
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Epitaxial Growth ◽  
Annealing Temperature ◽  
Perpendicular Magnetic Anisotropy ◽  
Multilayer Films ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Annealing Temperatures

Co3Pt films were deposited on Pt underlayers with various thicknesses by conventional sputtering in order to investigate the effect of Pt underlayers and annealing temperatures on their microstructure and the magnetic properties. From XRD and HRTEM analysises, as annealing at 300°C, a well epitaxial growth of Co3Pt (002) on Pt (111) underlayer that leads the film to present perpendicular magnetic anisotropy. However, Pt atoms in the Pt underlayer will diffuse seriously into Co3Pt layer as the annealing temperature is increased to 375°C that changes the compositions to approach equiatomic CoPt, and showing in-plane magnetic anisotropy with soft magnetic properties.

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