Magnetic Nanostructures Fabricated by Electrochemical Synthesis

2007 ◽  
Vol 121-123 ◽  
pp. 839-842 ◽  
Author(s):  
K. Keshoju ◽  
X. Gu ◽  
A.T. Kumar ◽  
L. Sun
Keyword(s):  
Thin Film ◽  
Magnetic Properties ◽  
Low Temperature ◽  
Curie Temperature ◽  
Magnetic Nanostructures ◽  
Cost Effective ◽  
Remnant Magnetization ◽  
Saturation Field ◽  
Alloy Electrodeposition ◽  
Nanoporous Structures

Electrochemical processing is a cost effective and low-temperature approach suitable for the fabrication of certain unique nanostructures that are difficult to obtain by other methods. Here we report on the synthesis of nanowires and nanoporous structures with the intention to control the magnetic properties of conventional materials. Nanowires with variable sizes (diameter 15 nm - microns, and length up to 100 microns) have been fabricated by template assisted electrodeposition. Utilizing a combined alloy electrodeposition and electrochemical dealloying approach, porous nanostructures with controlled pore size and porosity have also been synthesized. Magnetization, Curie temperature, coercivity, saturation field, and remnant magnetization of these magnetic nanostructures exhibit much wider tunibility compared to bulk and thin film samples.

scholarly journals Magnetic Properties of Layered Heisenberg Ferromagnets

1993 ◽  
Vol 46 (4) ◽  
pp. 571 ◽  
Author(s):  
A Du ◽  
GZ Wei
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Curie Temperature ◽  
Temperature Region ◽  
Asymptotic Form ◽  
Interlayer Coupling ◽  
Arbitrary Spin ◽  
Spin Fluctuations ◽  
Asymptotic Expressions ◽  
Double Time

The double-time-temperature spin Green's function method is used to study the magnetic properties of layered ferromagnets with arbitrary spin S, within Tyablikov's decoupling approximation. According to the extent to which interlayer coupling suppresses twodimensional spin fluctuations, we divide the low-temperature region into two new ones, and give the asymptotic expressions for magnetisation and susceptibility over different temperature regions, including the low-temperature region, the vicinity of the Curie temperature and the high-temperature region. We also give the Curie temperature in an asymptotic form when inter layer coupling is weak.

Depth trends in magnetic properties in an area of prolonged cold seawater drawdown in uppermost Troodos-type oceanic crust

1987 ◽  
Vol 24 (5) ◽  
pp. 941-952 ◽  
Author(s):  
James M. Hall ◽  
Charles Walls ◽  
Mark Williamson ◽  
Bing-Xi Wang
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Curie Temperature ◽  
Sedimentary Cover ◽  
Drill Core ◽  
Secondary Minerals ◽  
Troodos Ophiolite ◽  
Core Section ◽  
Discontinuous Nature ◽  
Magnetization Behaviour

Study of the oxide minerals and measurements of the magnetic properties of about 100 samples distributed over a 475 m continuous drill-core section from the uppermost part of an extrusive sequence of the Troodos, Cyprus, ophiolite close to 35°02′N, 33°11′E, in the vicinity of Malounda, yields the following principal results: (1) Low-temperature alteration is intense to a depth of 260 m, below which it is relatively much subdued. (2) Saturation magnetization, natural remanence intensity, and initial susceptibility all increase continuously with depth throughout the section. (3) Curie temperature decreases with depth to 260 m, below which a change in the style of the thermal decay of magnetization behaviour takes place. (4) Pillowed and massive flows differ in their magnetic properties.The results are consistent with the downwards decrease in low-temperature alteration also noted by K. Gillis from the distribution of secondary minerals. The downwards variations in magnetic properties closely follow in both sense and magnitude the trends observed in DSDP hole 417A, where marked downwards decrease in low-temperature alteration also occurs. This comparison and the discontinuous nature of the lower units of the Troodos sedimentary cover in the vicinity of hole CY-1 support the interpretation of the upper, reddened facies of the Troodos extrusive sequence as being due to prolonged drawdown of cold seawater and suggest that the magnetization of at least the upper part of the Troodos ophiolite is a reliable guide to ocean crust magnetization.

scholarly journals Influence of non-magnetic Cu on enhancing the low temperature magnetic properties and Curie temperature of FeCoNiCrCu(x) high entropy alloys

2020 ◽  
Vol 182 ◽  
pp. 99-103 ◽  
Author(s):  
Varun Chaudhary ◽  
Vishal Soni ◽  
Bharat Gwalani ◽  
R.V. Ramanujan ◽  
Rajarshi Banerjee
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Curie Temperature ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals Influence of Spin Fluctuation on the Magnetic Properties of EuO Ultra-thin Film

2013 ◽  
Vol 23 (3) ◽  
pp. 235
Author(s):  
Pham Huong Thao ◽  
Bach Thanh Cong
Keyword(s):  
Thin Film ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Nearest Neighbor ◽  
Spin Fluctuation ◽  
Mean Field ◽  
Field Method ◽  
The Other ◽  
Coupling Approximation ◽  
Exchange Approximation

The Gaussian spin fluctuation theory is applied to study magnetic properties (Curie temperature, magnetization) of EuO  ultra-thin films within nearest neighbor and next nearest neighbor exchange approximation. The dependence of Curie temperature on the thickness of the free EuO ultrathin film is calculated and compared with the results of the other mean field method- constant coupling approximation. The effect of nearly independence of saturation magnetization on the EuO film’s thickness measured  in [8] can be explained by controlling the next nearest neighbor exchange in presence of substrates.

The Influence of Quantum Size Effects on Magnetic Properties of Thin-Film Systems

2012 ◽  
Vol 190 ◽  
pp. 514-517 ◽  
Author(s):  
Elena E. Shalygina ◽  
Alisa Rozhnovskaya ◽  
Alexander Shalygin
Keyword(s):  
Thin Film ◽  
Magnetic Properties ◽  
Layer Thickness ◽  
Size Effects ◽  
Kerr Effect ◽  
Hysteresis Loops ◽  
Quantum Size Effects ◽  
Dc Magnetron Sputtering ◽  
Saturation Field ◽  
Quantum Size

Results on the investigation of magnetic and magneto-optical properties of Fe/NML/Fe (NML: Mo, Ta) thin-film systems are presented. The examined samples were prepared by DC magnetron sputtering technique. The hysteresis loops and spectral dependencies of the transverse Kerr effect (TKE) were measured employing the magneto-optical magnetometer and the magneto-optical spectrometer, respectively. The saturation field of the examined trilayers was revealed to oscillate as a function of the NML layer thickness, and the period of these oscillations to depend on the Fe layer thickness. The TKE spectra of the studied systems were found to be identical but the TKE values depend on the thickness of both Fe and Mo, Ta layers.

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