Effect of covalent element boron on exchange interaction and magnetic moment in Fe0.4Gd0.6 binary alloy

2004 ◽  
Vol 272-276 ◽  
pp. 1370-1371 ◽  
Author(s):  
K. Yano ◽  
E. Kita
Keyword(s):  
Exchange Interaction ◽  
Binary Alloy ◽  
Magnetic Moment

A Study of Exchange Interactions in R(FeCo)11TiCy (R=Y or Pr) Compounds

2011 ◽  
Vol 170 ◽  
pp. 223-226
Author(s):  
Corneliu Bazil Cizmas ◽  
Lotfi Bessais
Keyword(s):  
Magnetic Properties ◽  
Exchange Interaction ◽  
Magnetic Moment ◽  
Exchange Coupling ◽  
Interaction Strength ◽  
Exchange Interactions ◽  
Field Approximation ◽  
Molecular Field ◽  
Coupling Parameters ◽  
Structural And Magnetic Properties

The exchange interactions in PrFe11-xCoxTiCy (x=0÷2, y≤1), are analyzed on the basis of the structural and magnetic properties of polycrystalline samples. The magnetic properties of polycrystalline isomorphous compounds YFe11-xCoxTiCy have been used in order to determine the T (T=Fe+Co) sub-lattice contributions, such as the T sub-lattice mean magnetic moment and the T-T exchange interaction strength. The exchange coupling parameters JTT, JRT and the recurrent molecular field coefficients nTT, nRT have been calculated in the molecular field approximation (MCA). The effects of Co content and carbonation on the R-T (T=Fe+Co) and on the T-T exchange interactions are analyzed.

scholarly journals Особенности фокусировки спиновых волн в кристаллах EuO и EuS

2019 ◽  
Vol 61 (2) ◽  
pp. 257
Author(s):  
С.М. Бахарев ◽  
С.П. Савченко ◽  
А.П. Танкеев
Keyword(s):  
Exchange Interaction ◽  
Spin Wave ◽  
Lattice Constant ◽  
Brillouin Zone ◽  
Wave Vector ◽  
Magnetic Moment ◽  
Wave Focusing ◽  
Wave Approximation ◽  
Long Wave ◽  
Long Wave Approximation

AbstractSpecificities of spin wave focusing in EuO and EuS crystals are studied. It is shown that spin wave focusing is absent in the long-wave approximation: it is observed only for wave vectors in the second half of the Brillouin zone ( aq $$ \gtrsim $$ π, where a is the lattice constant and q is the magnitude of the wave vector). It was found that, for EuO and EuS crystals, the directions of spin wave focusing differ due to the different signs of the exchange integrals responsible for the exchange interaction of the magnetic moment with the second neighbors. The directions along which a magnon caustic is formed are determined.

scholarly journals Электронная структура и обменные взаимодействия соединений RNi-=SUB=-4-=/SUB=-Co (R=Eu,Yb)

2018 ◽  
Vol 60 (9) ◽  
pp. 1641
Author(s):  
Л.Н. Граматеева ◽  
А.В. Лукоянов
Keyword(s):  
Electronic Structure ◽  
Exchange Interaction ◽  
Magnetic Moment ◽  
Theoretical Approach ◽  
Exchange Interactions ◽  
Type A ◽  
Cobalt Ion ◽  
Self Consistent ◽  
Metal Sublattice ◽  
Total Energies

AbstractThe electronic structure and the exchange interactions in EuNi_4Co and YbNi_4Co compounds have been calculated in terms of a theoretical approach with the inclusion of electronic correlations (LSDA + U method); the variants of substitution of cobalt ion for nickel in the 3 d lattice in both types of crystallographic positions 2 c and 3 g are considered. The total energies obtained in self-consistent calculations show that individual cobalt impurities are more preferably arranged in position of the 3 g type. A Co ion in RNi_4Co (R = Eu, Yb) is characterized by a significant magnetic moment, which leads to significant increase in the exchange interaction of Co and Ni ions in the 3 d metal sublattice.

Fe magnetic moment formation and exchange interaction in Fe2P: A first-principles study

2013 ◽  
Vol 377 (9) ◽  
pp. 731-735 ◽  
Author(s):  
X.B. Liu ◽  
J. Ping Liu ◽  
Qiming Zhang ◽  
Z. Altounian
Keyword(s):  
Exchange Interaction ◽  
Magnetic Moment ◽  
First Principles ◽  
First Principles Study

Correlation between magnetic moment and exchange interaction distributions

1991 ◽  
Vol 77 (10) ◽  
pp. 757-761 ◽  
Author(s):  
I. Vincze ◽  
J. Balogh ◽  
Z. Fóris ◽  
D. Kaptás ◽  
T. Kemény
Keyword(s):  
Exchange Interaction ◽  
Magnetic Moment

Magnetic Moment and Saturation of Internal Magnetic Field in Co and Fe Clusters

1998 ◽  
Vol 12 (25) ◽  
pp. 2589-2598 ◽  
Author(s):  
M. Mahendran ◽  
K. Iyakutti
Keyword(s):  
Magnetic Field ◽  
Exchange Interaction ◽  
Magnetic Moment ◽  
Empirical Relation ◽  
Mean Field ◽  
Field Approximation ◽  
Internal Magnetic Field ◽  
Mean Field Approximation ◽  
Ferromagnetic Transition ◽  
Transition Metal Clusters

We have investigated the nature of internal magnetic field, exchange interaction and the effective magnetic moment per atom, μ eff , of ferromagnetic transition metal clusters, Fe and Co using the mean field approximation. Interestingly the exchange interaction and the internal magnetic field get saturated and both of them attain a constant value when the number of atoms in the cluster exceeds certain number. We find that, for all the clusters of Fe and Co μ eff decreases with increasing temperature. The surface effects are included in an indirect way through a geometry dependent empirical relation. A new quantity [Formula: see text] emerges out as a constant for a given cluster and this value depends linearly on N, the number of atoms in the cluster.

MAGNETIC BEHAVIOR OF Al2GdNi COMPOUND

2006 ◽  
Vol 20 (08) ◽  
pp. 401-408 ◽  
Author(s):  
M. COLDEA ◽  
V. POP ◽  
L. G. PASCUT ◽  
D. TODORAN ◽  
R. PACURARIU
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Fields ◽  
Exchange Interaction ◽  
Magnetic Moment ◽  
Magnetic Measurements ◽  
Spontaneous Magnetization ◽  
Magnetic Behavior ◽  
Spin Fluctuations ◽  
Local Exchange

The magnetic properties of Al 2 GdNi compound have been investigated using magnetic measurements in the temperature range 4.2–300 K and with magnetic fields of up to 9 T. Al 2 GdNi orders ferromagnetically at Tc = 36.7 K with a magnetic moment of 7.25 μB/ f.u. , obtained from the spontaneous magnetization extrapolated to 0 K. The magnetic susceptibility obeys the Curie–Weiss law with μ eff = 8.6 μB/ f.u. and θp = 26.8 K . The results are discussed in terms of the Ruderman–Kittel–Kasuya–Yosida theory, the polarization of 5d electrons by the local exchange interaction 4f-5d and the spin fluctuations on Ni sites.

Possible Ferromagnetism in YCuO System

2019 ◽  
Vol 298 ◽  
pp. 181-185
Author(s):  
Gong Qin Xu ◽  
Xiao Wei Chen ◽  
Xing Yu Mao
Keyword(s):  
Solid State ◽  
Exchange Interaction ◽  
Yttrium Oxide ◽  
Magnetic Moment ◽  
Solid State Reaction ◽  
Room Temperature ◽  
Magnetic Semiconductor ◽  
Itinerant Electron ◽  
Average Magnetic Moment ◽  
Ybco Superconductors

polycrystalline CuxYyOz are made through solid state reaction. Ferromagnetism is found in this YCuO system at room temperature. The ferromagnetism quite probably originates from Cu2Y2O5 , the Copper Yttrium Oxide. The average magnetic moment per Cu2+ is estimated to be 0.04μB. Itinerant electron magnetism is a rational explaination for the observed ferromagnetism. The experiment shows that the excessive amount of Cu may lead more defects and further distortion in the lattice and decrease the exchange interaction. This reminds us that the Copper Yttrium Oxide is a substance not only should be avoided in fabricating YBCO superconductors but also should be considered as a potential substance of magnetic semiconductor.

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