How the structure of ferromagnetic cluster boundaries in an antiferromagnetic matrix impacts their magnetic properties in an external field

2019 ◽  
Vol 45 (5) ◽  
pp. 500-508
Author(s):  
A. A. Krivchikov
Keyword(s):  
Magnetic Properties ◽  
External Field ◽  
Ferromagnetic Cluster

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.

Studies of Magneto-Optical Recording in Multi-Magnetic-Layer Disk by Analytic and Simulating Approaches

1993 ◽  
Vol 313 ◽  
Author(s):  
Yoshiyuki Kawazoe ◽  
Xiao Hu ◽  
Shigeru Honma
Keyword(s):  
Computer Simulation ◽  
Magnetic Properties ◽  
External Field ◽  
Theoretical Estimate ◽  
Magnetic Layer ◽  
Magnetic Coupling ◽  
Optical Recording ◽  
Analytic Approach ◽  
Layer System

ABSTRACTThe effect of magnetic coupling in Multi-layer system is discussed by an analytic approach and computer simulation. The dependence of the enhancement of external field on the magnetic properties of the relevant materials is studied. Comparison between the theoretical estimate, simulation result and experimental observations are presented.

Kondo-like electronic transport and ferromagnetic cluster-glass behavior in La0.7Sr0.3MnO3 nanostructures

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85950-85956 ◽  
Author(s):  
Hilal Ahmad Reshi ◽  
Shreeja Pillai ◽  
Rama Shanker Yadav ◽  
Touseef Ahmad Para ◽  
U. P. Deshpande ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Electronic Transport ◽  
Kondo Effect ◽  
Ferromagnetic Cluster ◽  
Magnetic Cluster ◽  
Cluster Behavior ◽  
Glass Behavior

We have studied the electronic transport and magnetic properties of a nanocrystalline La0.7Sr0.3MnO3 system. We observed low temperature Kondo effect with magnetic cluster behavior.

Innovative Melt-Spinning Technique for Ferromagnetic Amorphous Ribbons

1985 ◽  
Vol 58 ◽  
Author(s):  
H. Y. Yu ◽  
D. R. Huang ◽  
P. C. Yao ◽  
S. E. Hsu
Keyword(s):  
Magnetic Properties ◽  
External Field ◽  
Magnetic Moment ◽  
Melt Spinning ◽  
Amorphous Ribbon ◽  
Initial Permeability ◽  
Field Direction ◽  
Amorphous Ribbons ◽  
Melt Spinning Technique

ABSTRACTA new melt-spinning technique (field quenching) for ferromagnetic amorphous ribbon is suggested to produce better magnetic properties than conventional as-quenched amorphous ribbon. An external field is applied during the quenching either parallel or perpendicular to the casting direction. The magnetic moment and initial permeability are increased when the field direction is parallel to the casting direction. These effects are opposite when these two directions mentioned are perpendicular to each other.

scholarly journals Polysubstituted High-Entropy [LaNd](Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 Perovskites: Correlation of the Electrical and Magnetic Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1014
Author(s):  
Vladimir E. Zhivulin ◽  
Evgeniy A. Trofimov ◽  
Svetlana A. Gudkova ◽  
Igor Yu. Pashkeev ◽  
Alexander Yu. Punda ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Chemical Composition ◽  
Average Particle Size ◽  
Maximum Size ◽  
Average Particle ◽  
Ferromagnetic Cluster ◽  
High Entropy ◽  
Wide Range ◽  
Field Cooling

La-, Nd- and La/Nd-based polysubstituted high-entropy oxides (HEOs) were produced by solid-state reactions. Composition of the B-site was fixed for all samples (Cr0.2Mn0.2Fe0.2Co0.2Ni0.2) with varying of A-site cation (La, Nd and La0.5Nd0.5). Nominal chemical composition of the HEOs correlates well with initial calculated stoichiometry. All produced samples are single phase with perovskite-like structure. Average particle size is critically dependent on chemical composition. Minimal average particle size (~400 nm) was observed for the La-based sample and maximal average particle size (5.8 μm) was observed for the Nd-based sample. The values of the configurational entropy of mixing for each sample were calculated. Electrical properties were investigated in the wide range of temperatures (150–450 K) and frequencies (10−1–107 Hz). Results are discussed in terms of the variable range hopping and the small polaron hopping mechanisms. Magnetic properties were analyzed from the temperature and field dependences of the specific magnetization. The frustrated state of the spin subsystem was observed, and it can be a result of the increasing entropy state. From the Zero-Field-Cooling and Field-Cooling regimes (ZFC-FC) curves, we determine the <S> average and Smax maximum size of a ferromagnetic nanocluster in a paramagnetic matrix. The <S> average size of a ferromagnetic cluster is ~100 nm (La-CMFCNO) and ~60 nm (LN-CMFCNO). The Smax maximum size is ~210 nm (La-CMFCNO) and ~205 nm (LN-CMFCNO). For Nd-CMFCNO, spin glass state (ferromagnetic cluster lower than 30 nm) was observed due to f-d exchange at low temperatures.

Study of the magnetic properties of the electrotechnical steels by the zero external field μSR-technique

1991 ◽  
Vol 64 (1-4) ◽  
pp. 421-425
Author(s):  
S. P. Kruglov ◽  
L. A. Kuzmin ◽  
V. Yu. Miloserdin
Keyword(s):  
Magnetic Properties ◽  
External Field

scholarly journals THE EFFECT OF COBALT CONTENT ON MAGNETIC PROPERTIES OF CoFe ALLOYS

2020 ◽  
Vol 5 (2) ◽  
pp. 87-96
Author(s):  
Widia Nursiyanto ◽  
L. Rohman ◽  
M. Alfatun N. ◽  
E. Purwandari
Keyword(s):  
Magnetic Properties ◽  
External Field ◽  
Curie Temperature ◽  
Data Storage ◽  
Cobalt Content ◽  
Disk Drive ◽  
Storage Device ◽  
Temperature Changes ◽  
Atomistic Models ◽  
Coercivity Field

Hard Disk Drive (HDD) as a data storage device when operated with high temperatures (around 66oC), its function will be constrained. The CoFe alloys have a large coercivity field and can be patterned in very small sizes that are suitable for HDD devices. In this study, Co1-x Fex cube alloy was used (x = 0.25; 0.30; 0.50; 0.75). Samples were treated with temperature changes to get the Curie temperature. The coercivity field value is obtained by giving the external field and temperature below Curie temperature and also above Curie temperature to the samples. The VAMPIRE software is a micromagnetic simulation program based on atomistic models. The results showed that Curie’s temperature decreased when Co content increased. The composition of Co0.25 Fe0.75 has the highest Curie temperature that is equal to 1075 K. The temperature Curie is not affected by the size of the cube. When the sample is given a temperature rise below the Curie temperature, the value of the coercivity field decreases.  The value of the coercivity field is very difficult to determine when the temperature used is above the Curie temperature. The percentage of composition does not affect the coercivity field value. Therefore, cube-shaped CoFe material is very suitable for use as a material data storage device operated at temperatures below the Curie.

Effect of the external field on the soft magnetic properties and microstructure of directly cast Fe75P8.7B5C7Si4.3 nanocrystalline sheets

2015 ◽  
Vol 117 (17) ◽  
pp. 17B736 ◽  
Author(s):  
C. W. Shih ◽  
Y. Y. Lin ◽  
H. W. Chang ◽  
Y. I. Lee ◽  
W. C. Chang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
External Field ◽  
Soft Magnetic Properties ◽  
Soft Magnetic
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