Investigation of cation distributions and temperature-dependent magnetic properties of polycrystalline CoFe2O4

2020 ◽  
Author(s):  
A. Barik ◽  
M. R. Sahoo ◽  
Sweta Tiwary ◽  
R. Ghosh ◽  
P. N. Vishwakarma
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependent ◽  
Cation Distributions

Magnetic properties of undoped and Co-doped n-type β–FeSi2.5 single crystals

2002 ◽  
Vol 17 (11) ◽  
pp. 2960-2965 ◽  
Author(s):  
E. Arushanov ◽  
L. Ivanenko ◽  
D. Eckert ◽  
G. Behr ◽  
U. K. Rößler ◽  
...  
Keyword(s):  
Activation Energy ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
External Field ◽  
Single Crystals ◽  
Spin Glasses ◽  
Paramagnetic Centers ◽  
Temperature Dependent ◽  
Paramagnetic Curie Temperature ◽  
Co Doped

Results of magnetization and magnetic susceptibility measurements on undoped and Co-doped FeSi2.5 single crystals are presented. The temperature dependence of the magnetic susceptibility of the Co-doped sample in the range of 5–300 K can be explained by temperature-dependent contributions due to paramagnetic centers and the carriers excited thermally in the extrinsic conductivity region. The values of the paramagnetic Curie temperature and activation energy of the donor levels were estimated. It is also shown that the magnetic susceptibility of Co-doped samples cooled in zero external field and in a field are different. This resembles the properties of spin-glasses and indicates the presence of coupling between magnetic centers.

Variations in magnetic properties of Mexican serpentinites and related micro-textures 

2021 ◽  
Author(s):  
Sandra B. Ramírez-García ◽  
Luis M. Alva-Valdivia
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Ultramafic Rocks ◽  
Magnetic Carrier ◽  
Temperature Dependent ◽  
Geochemical Studies ◽  
The Relationship ◽  
Magnetite Formation

<p>Magnetite formation of serpentinized ultramafic rocks leads to variations in the magnetic properties of serpentinites; however, magnetite precipitation is still on debate.</p><p>In this work, we analyzed 60 cores of ultramafic rocks with a variety of serpentinization degrees. These rocks belong to the ultramafic-mafic San Juan de Otates complex in Guanajuato, Mexico. Geochemical studies have been previously conducted, enabling us to compare changes in the magnetic properties against the chemical variations generated by the serpentinization process. By studying the density and magnetic properties such as anisotropy of magnetic susceptibility, hysteresis curves as well as magnetic and temperature-dependent susceptibility and, we were able to identify the relationship between magnetic content and serpentinization degree, the predominant magnetic carrier, and to what extent the magnetite grain size depends on the serpentinization.  Variations in these parameters allowed us to better constrain the temperature at which serpentinization occurred, the generation of other Fe-rich phases such as Fe-brucite and/or Fe-rich serpentine as well as distinctive rock textures formed at different serpentinization degrees.</p>

Effects of Mn doping on temperature-dependent magnetic properties of L10 FeMnPt

2011 ◽  
Vol 109 (7) ◽  
pp. 07B747 ◽  
Author(s):  
D. B. Xu ◽  
J. S. Chen ◽  
T. J. Zhou ◽  
G. M. Chow
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependent ◽  
Mn Doping

Field and temperature dependent transport and magnetic properties of superconducting YNi2B2C

1995 ◽  
Vol 251 (1-2) ◽  
pp. 183-191 ◽  
Author(s):  
X.Z. Zhou ◽  
H.P. Kunkel ◽  
P.A. Stampe ◽  
J.A. Cowen ◽  
Gwyn Williams
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependent ◽  
Dependent Transport

Magnetic nanowires: Fabrication and characterization

2017 ◽  
Author(s):  
Kleber Roberto Pirota ◽  
Angela Knobel ◽  
Manuel Hernandez-Velez ◽  
Kornelius Nielsch ◽  
Manuel Vázquez
Keyword(s):  
Magnetic Properties ◽  
Dynamic Properties ◽  
Future Research ◽  
Magnetic Nanowires ◽  
Temperature Dependent ◽  
Alumina Membranes ◽  
Single Nanowires ◽  
Future Research Directions ◽  
Fabrication And Characterization

This article describes the fabrication and characterization of magnetic nanowires, focusing on the magnetic properties of patterned arrays of metallic magnetic nanowires electrodeposited into the pores of anodized-alumina membranes. It also discusses the complex magnetization processes, both in isolated nanowires and in collectively patterned arrays. After providing an overview of the state-of-the-art on fabrication techniques of nanowires, the article considers the microstructure of magnetic nanowires and the magnetic properties of single nanowires. It then examines the collective behavior of arrays where the interactions among the magnetic entities play an important role, along with the transport properties of magnetic nanowires, the temperature-dependent effects (such as magnetoelastic-induced anisotropy), and the dynamic properties of magnetization such as ferromagnetic resonance characteristics and spin-wave excitations in ferromagnetic nanowires. Finally, it presents an overview of future research directions.

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