PHASE DIAGRAMS FOR FILMS OF TWO-COMPONENT MAGNETIC ALLOYS

2000 ◽  
Vol 14 (28) ◽  
pp. 3279-3288 ◽  
Author(s):  
YUNSONG ZHOU ◽  
D. L. LIN
Keyword(s):  
Thin Film ◽  
Phase Diagrams ◽  
Exchange Coupling ◽  
Relative Concentration ◽  
Magnetic Films ◽  
Coupling Constants ◽  
Cumulant Expansion ◽  
Experimental Phase ◽  
Magnetic Alloys ◽  
Two Component

Phase diagrams for diluted bulk magnetic alloys and two-component magnetic films are investigated. On the basis of the Ising model for layered structures, we calculate the transition temperature as a function of the relative concentration x by means of the variational cumulant expansion. Both the ferromagnetic and antiferromagnetic interactions are considered and the exchange coupling constants between different atoms are treated as adjustable parameters. Experimental phase diagrams in the Tc-x plane for both La 2 Cu 1-x Zn x O 4 and Sm 2 Fe 14-x Co x Si 2 are qualitatively accounted for, and phase diagrams for a randomly mixed two-component thin film of magnetic alloys are predicted.

Magnetic Structures in Nonmag-/MAG-/Nonmag-Netic Sandwiches

1995 ◽  
Vol 384 ◽  
Author(s):  
Yoshiyuki Kawazoe ◽  
Xiao Hu
Keyword(s):  
Thin Film ◽  
Film Thickness ◽  
Phase Diagrams ◽  
Exchange Coupling ◽  
Spin Reorientation ◽  
Scaling Relations ◽  
Magnetic Thin Film ◽  
Magnetic Structures ◽  
Spin Reorientation Transition ◽  
Variational Formalism

ABSTRACTSpin-reorientation transition in magnetic thin film sandwiched by nonmagnetic materials is clarified by means of the variational formalism. Phase diagrams of the magnetization configuration are presented. Scaling relations among the film thickness, exchange coupling and magnetic anisotropies are revealed. A formula for the interface anisotropy is presented.

scholarly journals Спин-волновой резонанс в химически осажденных Fe-Ni пленках: измерения спин-волновой жесткости и константы поверхностной анизотропии

2018 ◽  
Vol 60 (2) ◽  
pp. 287
Author(s):  
И.Г. Важенина ◽  
Р.С. Исхаков ◽  
Л.А. Чеканова
Keyword(s):  
Spin Wave ◽  
Exchange Coupling ◽  
Magnetic Films ◽  
Coupling Constants ◽  
Surface Anisotropy ◽  
Entire Concentration Range ◽  
Surface Exchange ◽  
Ni Content ◽  
Thin Magnetic Films ◽  
Wave Resonance

AbstractSingle-layer Fe_ x Ni_1 - x thin magnetic films have been investigated by the spin-wave resonance technique in the entire concentration range. The surface anisotropy and exchange stiffness constants for the films with a Ni content from 30 to 80 at % have been measured from the experimental standing spin wave spectra. The surface exchange spin wave penetration depth δ_ C = 20–30 nm has been determined from the dependences of the surface anisotropy and exchange coupling constants on the Fe_20Ni_80 film thickness in the range of 250–400 nm.

Assessing the Calculation of Exchange Coupling Constants and Spin Crossover Gaps Using the Approximate Projection Model to Improve Density Function Calculations

2019 ◽  
Author(s):  
Xianghai Sheng ◽  
Lee Thompson ◽  
Hrant Hratchian
Keyword(s):  
Density Functional Theory ◽  
Exchange Coupling ◽  
Density Functional ◽  
Spin Crossover ◽  
Coupling Constants ◽  
Spin Projection ◽  
Coupling Constant ◽  
Projection Model ◽  
Functional Theory

This work evaluates the quality of exchange coupling constant and spin crossover gap calculations using density functional theory corrected by the Approximate Projection model. Results show that improvements using the Approximate Projection model range from modest to significant. This study demonstrates that, at least for the class of systems examined here, spin-projection generally improves the quality of density functional theory calculations of J-coupling constants and spin crossover gaps. Furthermore, it is shown that spin-projection can be important for both geometry optimization and energy evaluations. The Approximate Project model provides an affordable and practical approach for effectively correcting spin-contamination errors in molecular exchange coupling constant and spin crossover gap calculations.

Dual spiral sandwiched magnetic thin film inductor using Fe–Hf–N soft magnetic films as a magnetic core

2002 ◽  
Vol 239 (1-3) ◽  
pp. 579-581 ◽  
Author(s):  
K.H. Kim ◽  
D.W. Yoo ◽  
J.H. Jeong ◽  
J. Kim ◽  
S.H. Han ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetic Films ◽  
Magnetic Core ◽  
Magnetic Thin Film ◽  
Soft Magnetic ◽  
Soft Magnetic Films

Phase diagrams of site diluted ferromagnetic thin film

2006 ◽  
Vol 301 (1) ◽  
pp. 22-30 ◽  
Author(s):  
M. Hamedoun ◽  
K. Bouslykhane ◽  
H. Bakrim ◽  
A. Hourmatallah ◽  
N. Benzakour ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Diagrams

Stability of As and B doped Si with respect to overlaying CoSi2 and TiSi2 thin films

1989 ◽  
Vol 4 (5) ◽  
pp. 1209-1217 ◽  
Author(s):  
K. Maex ◽  
G. Ghosh ◽  
L. Delaey ◽  
V. Probst ◽  
P. Lippens ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Diagrams ◽  
Thermodynamic Data ◽  
Ternary Phase ◽  
Experimental Results ◽  
Silicide Formation ◽  
Isothermal Sections ◽  
Ternary Phase Diagrams ◽  
The Stability

The thermodynamic equilibrium of structures consisting of a thin film silicide (TiSi2 or CoSi2) on doped Si (with As or B) is investigated. Isothermal sections of the ternary phase diagrams for Ti–Si–B, Co–Si–B, Ti–Si–As, and Co–Si–As have been evaluated, indicating the stability of high B concentrations in Si underneath a CoSi2 layer, the instability of high As concentrations in Si underneath a CoSi2 layer, and of B and As concentrations underneath a TiSi2 layer. The obtained thermodynamic predictions agree very well with experimental results (i) on the redistribution of dopants during silicide formation, (ii) on the diffusion of dopants from an ion implanted silicide, and (iii) on the stability of highly doped regions underneath the silicide, both for the case of TiSi2 and CoSi2. It is shown that even though the inaccuracy of reported thermodynamic data is substantial, thermodynamic calculations provide a useful guidance and are consistent with the experimental results.

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