scholarly journals Mössbauer characterisations and magnetic properties of iron cobaltites CoxFe3−xO4 (1≤x≤2.46) before and after spinodal decomposition

2013 ◽  
Vol 334 ◽  
pp. 66-73 ◽  
Author(s):  
H. Le Trong ◽  
L. Presmanes ◽  
E. De Grave ◽  
A. Barnabé ◽  
C. Bonningue ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spinodal Decomposition ◽  
Before And After

Adhering magnetic molecules to surfaces

2015 ◽  
Vol 3 (46) ◽  
pp. 11986-11998 ◽  
Author(s):  
Rebecca J. Holmberg ◽  
Muralee Murugesu
Keyword(s):  
Magnetic Properties ◽  
Single Molecule ◽  
Molecular Design ◽  
Surface Interaction ◽  
Single Molecule Magnets ◽  
Magnetic Molecules ◽  
Before And After

In this review we aim to present an overview of the work that has been performed on attaching and studying Single-Molecule Magnets (SMMs) on various surfaces, with an emphasis on molecular design for surface interaction and on the magnetic properties before and after adhesion occurs.

Effect of separated layer thickness on magnetoresistance and magnetic properties of Co/Dy/Co and Ni/Dy/Ni film systems

2018 ◽  
Vol 32 (01) ◽  
pp. 1750275 ◽  
Author(s):  
T. M. Shabelnyk ◽  
O. V. Shutylieva ◽  
S. I. Vorobiov ◽  
I. M. Pazukha ◽  
A. M. Chornous
Keyword(s):  
Magnetic Properties ◽  
Layer Thickness ◽  
Phase State ◽  
Diffusion Processes ◽  
Hysteresis Loops ◽  
Before And After ◽  
Beam Sputtering ◽  
Diffraction Patterns ◽  
20 Nm ◽  
And Diffusion

Co(5 nm)/Dy(t[Formula: see text])/Co(20 nm)/S and Ni(5 nm)/Dy(t[Formula: see text])/Ni(20 nm)/S trilayer films are prepared by electron-beam sputtering to investigate the influence of dysprosium layer thickness (t[Formula: see text]) and thermal annealing on the crystal structure, magnetoresistance (MR) and magnetic properties of thin films. The thickness of Dy layer changed in the range from 1 nm to 20 nm. The samples annealed for 20 min at 700 K. Electron diffraction patterns reveal that the as-deposited and annealed systems Co/Dy/Co and Ni/Dy/Ni had fcc-Co + hcp-Dy and fcc-Ni + hcp-Dy phase state, respectively. It is also shown that at the t[Formula: see text] = 15 nm the transition from amorphous to crystalline structures of Dy layer is observed. An increase in the Dy layer thickness results in changes in the MR and magnetic properties of the trilayer systems. It is shown that MR is most thermally stable against annealing to 700 K at t[Formula: see text] = 15 nm for Co/Dy/Co as well as for Ni/Dy/Ni. For t[Formula: see text] = 15 nm the, value of MR for both system increases by two times compared to those of pure ferromagnetic (FM) samples. The coercivity (B[Formula: see text]), remanent (M[Formula: see text]) and saturation (M[Formula: see text]) magnetization of the in-plain magnetization hysteresis loops are related to the Dy layer thickness too. The coercivity depends on the FM materials type and diffusion processes at the layer boundary. Accordingly, M[Formula: see text] and M[Formula: see text] are reduced with t[Formula: see text] increasing before and after annealing for both trilayer systems.

The Effects of Ternary Elemental Additions on the Structure and Magnetic Properties of Nanocrystalline Feco Powders

2002 ◽  
Vol 753 ◽  
Author(s):  
I. Baker ◽  
R. G. Quiller ◽  
M. Robson ◽  
D. Wu
Keyword(s):  
Magnetic Properties ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
Before And After ◽  
Diffraction Peaks ◽  
Computer Controlled ◽  
Steel Balls ◽  
Scanning Electron

ABSTRACTPowders of near-equiatomic Fe and Co were mechanically milled with additions of Zr, C, Ni, Cu and/or B for 60 hr using stainless steel balls in a Svegari attritor operated at 1300 r.p.m. under argon. The milled powders were examined before and after annealing at 600 °C. The morphologies and sizes of the powders were examined using a scanning electron microscope. The grain sizes were characterized from the widths of X-ray diffraction peaks obtained using a computer-controlled x-ray diffractometer and the lattice parameters were determined. The resulting magnetic properties were measured using a vibrating sample magnetometer.

Transport and magnetic properties of multiwall carbon nanotubes before and after bromination

2002 ◽  
Vol 44 (4) ◽  
pp. 659-662 ◽  
Author(s):  
A. I. Romanenko ◽  
O. B. Anikeeva ◽  
A. V. Okotrub ◽  
L. G. Bulusheva ◽  
N. F. Yudanov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Multiwall Carbon Nanotubes ◽  
Before And After ◽  
Multiwall Carbon

scholarly journals A comparative thermomagnetic study of melt-spun Nd-Fe-B alloys with different Nd content

2009 ◽  
Vol 41 (3) ◽  
pp. 337-345 ◽  
Author(s):  
A. Grujic ◽  
T. Zák ◽  
N. Talijan ◽  
J. Stajic-Trosic ◽  
V. Cosovic
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Magnetic State ◽  
Hysteresis Loops ◽  
Direct Influence ◽  
X Ray ◽  
Thermomagnetic Analysis ◽  
Melt Spun ◽  
Before And After ◽  
Fe2b Phase

Changes in the phase composition and magnetic properties of three types of commercial Nd-Fe-B alloys with different Nd content - low (10-12 wt%), near stoichiometric (21-25 wt%) and rich (26-29 wt%) caused by thermomagnetic analysis (TM) were observed in regard to optimal magnetic state. Phase compositions of investigated alloys before and after TM measurement up to 800?C were compared using 57Fe M?ssbauer spectroscopy and X-Ray analysis. The TM measurements decompose all three materials and the main products of decomposition process ?-Fe and Fe2B phase. Observed changes in structure and phase composition had direct influence on magnetic properties. Loss of magnetic properties induced by thermal decomposition is clearly illustrated on corresponding SQUID hysteresis loops.

Preparation of In Situ Magnetically Loaded Cellulose Fibers

1990 ◽  
Vol 197 ◽  
Author(s):  
Serge Ricard ◽  
Robert H. Marchessault
Keyword(s):  
Magnetic Properties ◽  
Floppy Disk ◽  
Information Storage ◽  
Oxidation Reactions ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Storage Security ◽  
New Concepts ◽  
Before And After

ABSTRACTMagnetic paper handsheets with pigment loadings in the order of 10–30%, depending on the experimental conditions, have been made using the established “lumen-loading” technology. These sheets have bulk magnetic properties comparable with the computer floppy-disk products. In order to minimize the particle size of pigments and thereby explore a new level of optical and magnetic properties, in situ synthesis of pigment particles is a second approach. This chemistry starts with a carboxymethylcellulose substrate with ion-exchange properties for Fe(ll). The substrates, before and after oxidation reactions to produce ferrite particles, are characterized by: conductimetric titration, x-ray diffraction, thermogravimetric analysis, and magnetization determination. Electron microscopy and diffraction provide insight on the ferrite morphologicals. These specialty fibers allow exploration of new concepts in papermaking, information storage, security printing and paper handling.

Magnetic properties of LaNi3.55Mn0.4Al0.3Co0.75−xFex (x=0, 0.35) compounds before and after electrochemical cycles

2002 ◽  
Vol 242-245 ◽  
pp. 850-853 ◽  
Author(s):  
M. Ayari ◽  
V. Paul-Boncour ◽  
J. Lamloumi ◽  
A. Percheron-Guégan
Keyword(s):  
Magnetic Properties ◽  
Before And After

Effect of Iron Oxide on the Structure, Electrical and Magnetic Properties of (70% mole V2O5- (15-x)% mole P2O5-15% mole B2O3) Semi Conducting Glass System

2007 ◽  
Vol 280-283 ◽  
pp. 327-332 ◽  
Author(s):  
E.E. Assem
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Treatment Time ◽  
Glass System ◽  
X Ray Diffraction ◽  
Electrical And Magnetic Properties ◽  
Heat Treated ◽  
Conductivity Increase ◽  
Before And After

A glass system according to the molar formula (70% mole V2O5- (15-x)% mole P2O5-15% mole B2O3), where x = 0, 1, 2.5, 5 and 7.5 % mole Fe2O3, was prepared by melting the pure powder chemicals at porcelain crucibles at 1000Co for three hours until the homogenous glass was obtained. The samples were quenched in air and heat-treated at 500 Co for 1, 2 and 3 h. The density, the molar volume, the electrical conductivity and magnetic properties were measured before and after the heat-treatment. The crystalline phases due to heat-treatment were determined using x-ray diffraction. The heat-treatment causes change of BO3 to BO4 and forming non-bridging oxygen. Replacing the phosphorus oxide with the iron oxide increases the magnetic properties while the conductivity increase up to 5% mole and then decreases. The changes of electrical and magnetic properties with heat-treatment time have a random behavior due to the change of the structure if the samples with heat treatment.

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