A study of the magnetic properties and the magneto-crystalline anisotropy for the nano-composites CoFe2O4/Sm0.7La0.3FeO3

2021 ◽  
Author(s):  
Ebtesam E. Ateia ◽  
M. K. Abdelmaksoud ◽  
H. Ismail
Keyword(s):  
Magnetic Properties ◽  
Nano Composites ◽  
Crystalline Anisotropy ◽  
Magneto Crystalline Anisotropy

Interface effects on the magnetic properties of layered Ni2MnGa/Ni2MnSn alloys: A first-principles investigation

2016 ◽  
Vol 09 (06) ◽  
pp. 1642010 ◽  
Author(s):  
Biswanath Dutta ◽  
Ingo Opahle ◽  
Tilmann Hickel
Keyword(s):  
Magnetic Properties ◽  
First Principles ◽  
Density Functional ◽  
Functional Theory ◽  
Multilayer Systems ◽  
Crystalline Anisotropy ◽  
Additive Contribution ◽  
Spin Moments ◽  
Magneto Crystalline Anisotropy ◽  
Interface Effects

The effect of interfaces on the magnetic properties of multilayers is analyzed for Ni2MnGa/Ni2MnSn system using density functional theory. The Ni spin moments at the interface change by about 30% compared to the bulk value, whereas the effect on the Mn spin moments is much less pronounced. A similar strong effect is also observed for the Ni orbital moments at the interface. The magneto-crystalline anisotropy of the multilayer systems can be understood by the additive contribution of the respective values of strained bulk materials.

scholarly journals Rare earth ion contribution in barium hexaferrite structure to a change of magnetocrystalline anisotropy to improving its magnetic properties

2020 ◽  
pp. 1-13
Author(s):  
I Gusti Agung Putra Adnyana
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Barium Hexaferrite ◽  
Particle Morphology ◽  
Solid State Reactions ◽  
Phase Identification ◽  
Rare Earth Ion ◽  
Crystalline Anisotropy ◽  
Materials Used ◽  
Magneto Crystalline Anisotropy

Rare earth ion contribution in barium hexaferrite structure to a change of magneto-crystalline anisotropy to improving its magnetic properties has been investigated. A series of simples of Ba1-xCexFe12O19 with the variation of x (x = 0.0-0.5) were prepared by solid-state reactions using mechanical deformation techniques. The oxide materials used for sample preparation are BaCO3, Fe2O3, and CeO2 with the ratio of material used is adjusted to the stoichiometric calculation for variations of Ce4+ substitution. The phase identification results show that the reaction took place perfectly and successfully formed a single-phase Ba1-xCexFe12O19 namely at the composition x = 0 and x = 0.1. while for the composition x> 0.1, it is formed in three phases. Particle morphology in the composition x = 0 and x = 0.1 has very good and uniform particle homogeneity across the surface of the sample in the form of polygonal particles. So the substitution of Ce atoms into the barium hexaferrite structure is only able at the composition limit x = 0.1. In the composition x = 0.1 has been able to increase the coercivity and magnetization fields. It can be concluded that the permanent magnet with the composition Ba0,9Ce0.1F12O19 gives the best results.

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.

scholarly journals Studies on Structural and Magnetic Properties in Co/Sm Multilayers

2012 ◽  
Vol 13 (1) ◽  
pp. 13
Author(s):  
Erwin Erwin
Keyword(s):  
Magnetic Properties ◽  
Multilayer Films ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
X Ray ◽  
Crystalline Anisotropy ◽  
Structural And Magnetic Properties ◽  
Sharp Interfaces ◽  
Magneto Crystalline Anisotropy

Co/Sm multilayer films with structure of 20 [Co (x nm)/Sm (1.2 nm)] where x = 1.1, 2.2 and 4.2 nm and 20[Co (4.2nm)/Sm (x nm)] where x=1.2 nm to 7.5 nm were fabricated using dc magnetron sputtering. Each multilayer filmconsisted of 20 bilayers of Co layers with various thicknesses sandwiched with Sm layers. The application of lowangle X-ray diffraction measurements to the characterization of these multilayers is described. The periodiclayered structure with sharp interfaces was observed for all multilayer films. The measured magnetization valuesare lower than the values calculated in terms of the nominal concentration of cobalt in the multilayers. This impliessignificant “mixing” at small film thickness. The formation of a high magneto crystalline anisotropy of CoSm alloyat the interfaces, as a result of interdiffusion between Co and Sm layers was considered to be responsible for theincrease of the coercivity for Co/Sm multilayer.

scholarly journals Structural and Magnetic Properties of Nanosized Barium Hexaferrite Powders Obtained by Microemulsion Technique

2010 ◽  
Vol 159 ◽  
pp. 57-62 ◽  
Author(s):  
Tatyana Koutzarova ◽  
Svetoslav Kolev ◽  
Kornely Grigorov ◽  
Chavdar Ghelev ◽  
Andrzej Zaleski ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Average Particle Size ◽  
Barium Hexaferrite ◽  
Anisotropy Field ◽  
Microemulsion System ◽  
Average Particle ◽  
Crystalline Anisotropy ◽  
Magneto Crystalline Anisotropy

Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were studied. A water-in-oil reverse microemulsion system with cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, n-butanol as a co-surfactant, n-hexanol as a continuous oil phase, and an aqueous phase were used. The microstructural and magnetic properties were investigated. The particles obtained were mono-domain with average particle size 280 nm. The magnetic properties of the powder were investigated at 4.2 K and at room temperature. The saturation magnetization was 48.86 emu/g and the coercivity, 2.4 x 105 A/m at room temperature. The anisotropy field Ha and magneto-crystalline anisotropy K1 were 1.4 x 106 A/m and 2.37 x 105 J/m3, respectively.

scholarly journals Effect of large mechanical stress on the magnetic properties of embedded Fe nanoparticles

2011 ◽  
Vol 2 ◽  
pp. 268-275 ◽  
Author(s):  
Srinivasa Saranu ◽  
Sören Selve ◽  
Ute Kaiser ◽  
Luyang Han ◽  
Ulf Wiedwald ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Data Storage ◽  
Dominant Role ◽  
Magnetic Film ◽  
Biaxial Stress ◽  
Magnetic Data ◽  
Particle Volume ◽  
Crystalline Anisotropy ◽  
Magneto Crystalline Anisotropy

Magnetic nanoparticles are promising candidates for next generation high density magnetic data storage devices. Data storage requires precise control of the magnetic properties of materials, in which the magnetic anisotropy plays a dominant role. Since the total magneto-crystalline anisotropy energy scales with the particle volume, the storage density in media composed of individual nanoparticles is limited by the onset of superparamagnetism. One solution to overcome this limitation is the use of materials with extremely large magneto-crystalline anisotropy. In this article, we follow an alternative approach by using magneto-elastic interactions to tailor the total effective magnetic anisotropy of the nanoparticles. By applying large biaxial stress to nanoparticles embedded in a non-magnetic film, it is demonstrated that a significant modification of the magnetic properties can be achieved. The stress is applied to the nanoparticles through expansion of the substrate during hydrogen loading. Experimental evidence for stress induced magnetic effects is presented based on temperature-dependent magnetization curves of superparamagnetic Fe particles. The results show the potential of the approach for adjusting the magnetic properties of nanoparticles, which is essential for application in future data storage media.

Crystal Field Analysis of the Magnetization Curves of HoFe11Ti under High Pressure

2013 ◽  
Vol 818 ◽  
pp. 72-76 ◽  
Author(s):  
Gang Su
Keyword(s):  
High Pressure ◽  
Hydrogen Atom ◽  
Electric Field ◽  
Single Crystals ◽  
High Pressures ◽  
Field Analysis ◽  
Magnetization Curves ◽  
Crystalline Electric Field ◽  
Crystalline Anisotropy ◽  
Magneto Crystalline Anisotropy

The crystalline electric field parameters Anmfor HoFe11Ti under different pressures were evaluated by fitting calculations to the magnetization curves measured on the single crystals at several temperatures. It was found that magneto-crystalline anisotropy has been changed by high pressure and the Anmfor HoFe11Ti under high pressures are strikingly different from Anmfor the corresponding HoFe11Ti H with interstitial hydrogen atom.

Magneto-crystalline anisotropy of Fe-Ni Invar alloys

Physica B+C ◽  
1977 ◽  
Vol 86-88 ◽  
pp. 299-300
Author(s):  
O. Yamada ◽  
F. Ono ◽  
K. Mitsuoka
Keyword(s):  
Invar Alloys ◽  
Crystalline Anisotropy ◽  
Magneto Crystalline Anisotropy
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