Hydrogenation and Magnetic Properties of Pd/Co Multilayers

1996 ◽  
Vol 458 ◽  
Author(s):  
A. Suzuki ◽  
K. Kyuno ◽  
E. Akiba ◽  
T. Manago ◽  
H. Miyajima ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Unit Volume ◽  
Unit Area ◽  
Perpendicular Magnetic Anisotropy ◽  
Anisotropy Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Crystalline ◽  
Xrd Patterns

ABSTRACTThe magnetic properties of sputtered Pd/Co multilaysers in hydrogen atmospheres were studied. The x-ray diffraction(XRD) patterns in hydrogen atmospheres showed that the lattice expansion of hydrogenated Pd decreased with decreasing thickness of Pd layers, which is reminiscent of nano-crystalline Pd. Perpendicular magnetic anisotropy(PMA) and saturation magnetization were reduced by the hydrogénation. The interface anisotropy energy per unit area, Ks, and volume anisotropy energy per unit volume, Kv are discussed. These results suggest that interface magnetic anisotropy between Pd and Co layers is suppressed by hydrogenation.

scholarly journals Influence of Li2CO3 addition on electrical and magnetic properties of Ni0.6Mg0.4Fe2O4

2020 ◽  
Vol 10 (03) ◽  
pp. 2050003
Author(s):  
M. R. Hassan ◽  
M. T. Islam ◽  
M. N. I. Khan
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Low Frequency ◽  
Solid State Reaction Method ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical And Magnetic Properties ◽  
Frequency Regime ◽  
Xrd Patterns

In this research, influence of adding Li2CO3 (at 0%, 2%, 4%, 6%) on electrical and magnetic properties of [Formula: see text][Formula: see text]Fe2O4 (with 60% Ni and 40% Mg) ferrite has been studied. The samples are prepared by solid state reaction method and sintered at 1300∘C for 6[Formula: see text]h. X-ray diffraction (XRD) patterns show the samples belong to single-phase cubic structure without any impurity phase. The magnetic properties (saturation magnetization and coercivity) of the samples have been investigated by VSM and found that the higher concentration of Li2CO3 reduces the hysteresis loss. DC resistivity increases with Li2CO3 contents whereas it decreases initially and then becomes constant at lower value with temperature which indicates that the studied samples are semiconductor. The dielectric dispersion occurs at a low-frequency regime and the loss peaks are formed in a higher frequency regime, which are due to the presence of resonance between applied frequency and hopping frequency of charge carriers. Notably, the loss peaks are shifted to the lower frequency with Li2CO3 additions.

Study of the magnetic and structural properties of Al–Cr codoped Y-type hexaferrite prepared via sol–gel auto-combustion method

2015 ◽  
Vol 29 (14) ◽  
pp. 1550090 ◽  
Author(s):  
O. Mirzaee ◽  
R. Mohamady ◽  
A. Ghasemi ◽  
Y. Alizad Farzin
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Combustion Method ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexagonal Shape ◽  
Auto Combustion ◽  
Xrd Patterns ◽  
Cr Doping

Nanostructure of Y-type hexaferrite with composition of Sr 2 Ni 2 Al x/2 Cr x/2 Fe 12-x O 22 (where x are 0, 0.6, 1.2, 1.8, 2.4 and 3) were prepared by sol–gel auto-combustion method. The influence of Al and Cr doping on the structural and magnetic properties has been investigated. The X-ray diffraction (XRD) patterns confirm phase formation of Y-type hexaferrite. The microstructure and morphology of prepared samples were studied by high resolution field emission scanning electron microscope (FESEM) which shows the hexagonal shape for all of the samples. Magnetic properties were characterized using vibrating sample magnetometer (VSM). The magnetic results revealed that by increasing the Al and Cr to the structure, the coercivity was also increased from 840 Oe to 1160 Oe. Moreover it has been shown that with addition of dopants, saturation magnetization (Ms) and remnant magnetization (Mr) were decreased from 39.61 emu/g to 30.11 emu/g and from 17.51 emu/g to 14.62 emu/g, respectively, due to the entrance of nonmagnetic ions into Fe 3+ sites.

Magnetic Properties of Tb(Ni0.95Fe0.05)3 Crystalline Compound and Powder

2013 ◽  
Vol 203-204 ◽  
pp. 292-295 ◽  
Author(s):  
Krzysztof Ociepka ◽  
Ania Bajorek ◽  
Artur Chrobak ◽  
Grażyna Chełkowska
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetocaloric Effect ◽  
Milling Time ◽  
Crystalline Compound ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Melting Technique ◽  
Xrd Patterns

The magnetic properties and the crystal structure of the ball-milled Tb(Ni0.95Fe0.05)3compound have been studied by using magnetization measurements and X-ray diffraction (XRD). The results were compared with those obtained for the bulk compound prepared by arc-melting technique. The investigated sample is polycrystalline and crystallizes in the rhombohedral PuNi3type of crystal structure (space group R-3m). With the increase of the time milling (i.e. 1 h, 24 h and 48 h) a for-mation of grains less than 1μm and a reduction of magnetocaloric effect have been observed. The analysis of XRD patterns for ball-milled powders shows that after 48h milling time there is still visible a crystalline structure.

Proficient Ni-Zn-Cr Ferrites: Synthesis and Characterization

2012 ◽  
Vol 510-511 ◽  
pp. 343-347
Author(s):  
S. Nasir ◽  
M.A. Malik ◽  
G. Asghar ◽  
G.H. Tariq ◽  
M. Akram ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zn Ferrite ◽  
Phase Spinel ◽  
Scherrer Formula ◽  
Xrd Patterns ◽  
Cr Doping

Ni-Zn ferrite nanoparticles with Cr doping, having the general formula Ni0.5Zn0.5CrxFe2-xO4(x = 0.1, 0.3, 0.5) were prepared by simplified sol-gel method and sintered at 750±5°C. The structural and magnetic properties of the samples sintered at 750±5°C were studied. From X-ray diffraction (XRD) patterns, it was confirmed that the samples have single phase spinel structure. The crystallite size was calculated from the most intense peak (3 1 1) using the Debye Scherrer formula and was found to be in the range of 29-34 nm. The scanning electron microscope images showed that the particle size of the samples were in the range 60-120nm. Quantum design PPMS model 6700 was used to study magnetic properties of these samples. The effect of Cr doping on the magnetic properties was explained on the basis of cations distribution in the crystal structure.

scholarly journals Structure, Microstructure, and Magnetic Properties of Melt Spun Ni50Mn50−xInx Ribbons

2021 ◽  
Vol 7 (5) ◽  
pp. 63
Author(s):  
Karima Dadda ◽  
Safia Alleg ◽  
Joan Saurina ◽  
Lluïsa Escoda ◽  
Joan-Josep Suñol
Keyword(s):  
Magnetic Properties ◽  
Thermal Hysteresis ◽  
Equilibrium Temperature ◽  
Indium Content ◽  
Martensitic Transition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Xrd Patterns ◽  
Microstructure And Magnetic Properties

Structural, microstructural, and magnetic properties of Heusler Ni50Mn50−xInx (x = 5 and 10) ribbons have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), differential scanning calorimetry (DSC), and vibrating sample magnetometry (VSM). The as quenched Ni50Mn45In5 ribbons exhibit a mixture of monoclinic 14M (a = 4.329(3) Å, b = 5.530(3) Å, and c = 28.916(3) Å), and tetragonal L10 (a = b = 3.533(3) Å, and c = 7.522(3) Å) martensite structures, while Ni50Mn40In10 ribbons display a single monoclinic 14M phase (a = 4.262(3) Å, b = 5.692(3) Å, and c = 29.276(3) Å). After three heating/cooling cycles, in the temperature range of 303–873 K, the Rietveld refinement of the XRD patterns revealed the presence of a single 14M martensite for Ni50Mn45In5 ribbons, and a mixture of cubic L21 (31%) and 14M (69%) phases for Ni50Mn40In10 ribbons. The characteristic temperatures of the martensitic transition (Astart, Afinish, Mstart, and Mfinish), the thermal hysteresis temperature width, and the equilibrium temperature decreased with increasing indium content and heating cycles. The samples show a paramagnetic like behavior in the as quenched state, and a ferromagnetic like behavior after the third heating/cooling cycle.

scholarly journals Synthesis of Pd-based Tsai-type 1/1 approximants

2014 ◽  
Vol 70 (a1) ◽  
pp. C89-C89
Author(s):  
Reiko Fukami ◽  
Takanobu Hiroto ◽  
Ryuji Tamira
Keyword(s):  
Magnetic Properties ◽  
The Other ◽  
Formation Condition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Formation Conditions ◽  
Xrd Patterns ◽  
Equilibrium Phases

Recently, a new Tsai-type 1/1 approximant (AP) was discovered in the Pd-Ge-Yb system by Kashimoto et al[1]. In this alloy, the Yb valence was found to be in an intermediate state between Yb2+ and Yb3+. On the other hand, various magnetic transitions were found in other rare-earth (RE) bearing Tsai-type APs. In this work, the formation condition and magnetic property of Pd-M-RE appximants were investigated. Mother ingots of various conditions based on Pd-M-Yb[1], were prepared by arc melting followed by various heattreatment conditions to obtain homogeneous equilibrium phases. The Phase constitutions were studied by powder X-ray diffraction (XRD). The obtained XRD patterns can be indexed as 1/1 AP. The details of the formation conditions as well as magnetic properties will be presented in the poster.

Preparation and Magnetic Properties of Nanocrystalline (Fe,Cr)-N

2012 ◽  
Vol 625 ◽  
pp. 222-225
Author(s):  
Wen Jiang Feng ◽  
Chuan Yin Wang ◽  
Hao Hua Zhang
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Magnetic Properties ◽  
Magnetic Moment ◽  
Single Phase ◽  
Nitrogen Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Crystalline ◽  
Intrinsic Magnetic Moment

The nano-crystalline (Fe,Cr)N was prepared as a single phase by milling Fe80Cr20 in a nitrogen atmosphere. Its crystal structure is determined to be the cubic rock salt-type CrN by X-ray diffraction measurements. The nano-crystalline is stable up to above 773 K and decomposes into (Fe,Cr)N and Fe-Cr solid solution. Due to the combination of Fe atoms and N ones, the intrinsic magnetic moment of Fe atoms is reduced, which is confirmed by our measurements.

Magnetic Properties of Mg0.4Ca0.6Fe2O4 Nanoparticles Synthesized by Sol-Gel Method for Hyperthermia Treatment

2014 ◽  
Vol 631 ◽  
pp. 193-197
Author(s):  
A.M. Escamilla-Pérez ◽  
D.A. Cortés-Hernández ◽  
J.M. Almanza-Robles ◽  
D. Mantovani ◽  
P. Chevallier
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Hyperthermia Treatment ◽  
X Ray ◽  
Transmission Electron ◽  
Heat Treated ◽  
Different Temperatures ◽  
Xrd Patterns

Powders of Mg0.4Ca0.6Fe2O4were prepared by sol-gel using ethylene glycol and Mg, Ca and Fe nitrates as starting materials. Those powders were heat treated at different temperatures (300, 400, 500 and 600 °C) for 30 min. The materials obtained were characterized by X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). The Ca-Mg ferrite with the most appropriate magnetic properties was further analyzed by transmission electron microscopy (TEM). The heating capability of the nanoferrites was also tested via magnetic induction. The XRD patterns of these Ca-Mg ferrites showed a cubic inverse spinel structure. Furthermore, neither traces of hematite nor orthorhombic Ca ferrite phases were detected. Moreover, all the Ca-Mg ferrites are superparamagnetic and the particle size distribution of these Ca-Mg magnetic nanoparticles exhibits an average diameter within the range of 10-14 nm. The needed temperature for hyperthermia treatment was achieved at around 12 min.

First Observation of Non-Resonant X-Ray Magnetic Diffraction for Multilayers

2016 ◽  
Vol 698 ◽  
pp. 3-7
Author(s):  
Hidefumi Shimoyama ◽  
Tokiko Osawa ◽  
Hiromi Watanabe ◽  
Kosuke Suzuki ◽  
Hiroshi Sakurai ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Hysteresis ◽  
Perpendicular Magnetic Anisotropy ◽  
Diffraction Method ◽  
Magnetic Multilayers ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Magnetization Direction ◽  
X Ray ◽  
First Time

Co/Pd magnetic multilayers have been prepared by using a sputtering method. Lattice distances and magnetic hysteresis curves have been measured by X-ray diffraction (XRD) measurements and magnetization measurements using a vibrating sample magnetometer (VSM). The XRD measurements have shown that the samples with thinner Pd layers have shorter lattice distances, and the VSM measurements have shown that the samples of thinner Co and thicker Pd layers are closer to those of perpendicular magnetic anisotropy. We have applied the X-ray magnetic diffraction method to the Co/Pd multilayer for the first time and have succeeded in observing a change in the X-ray diffraction intensities by the reversal of the magnetization direction.

scholarly journals EFFECT OF CO-DOPED RARE-EARTH AND TRANSITION-METAL IONS ON STRUCTURAL, OPTICAL AND MAGNETIC PROPERTIES OF BiFeO3 MATERIAL

2018 ◽  
Vol 54 (1A) ◽  
pp. 96
Author(s):  
Dao Viet Thang
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Transition Metal Ions ◽  
Scattering Data ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optical And Magnetic Properties ◽  
Xrd Patterns ◽  
Co Doped

Structural, optical and magnetic properties of polycrystalline BiFeO3 and Bi0.9RE0.1Fe0.95Ni0.05O3 (RE = Sm, Y, Nd) prepared by sol–gel method have been investigated. X-ray diffraction (XRD) patterns reveal that all samples crystalize in rhombohedrally distorted perovskite structure belonging to space group R3c. Analyzed results of both XRD and Raman scattering data show an increase of lattice distortion with co-replacing of rare earths and nickel atoms into Bi and Fe sites respectively. All samples exhibit a weak ferromagnetic behavior at room temperature with enhancement of the magnetization of RE and Ni co-doped samples.

Sign in / Sign up

Export Citation Format

Share Document