Mean-field theory for spin-reorientation phase transitions in magnetic thin films

1995 ◽  
Vol 51 (1) ◽  
pp. 311-315 ◽  
Author(s):  
Xiao Hu ◽  
Yoshiyuki Kawazoe
Keyword(s):  
Field Theory ◽  
Thin Films ◽  
Phase Transitions ◽  
Mean Field Theory ◽  
Mean Field ◽  
Magnetic Thin Films ◽  
Spin Reorientation

scholarly journals Interfacial width and phase equilibrium in polymer-fullerene thin-films

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
E. L. Hynes ◽  
J. T. Cabral ◽  
A. J. Parnell ◽  
P. Gutfreund ◽  
R. J. L. Welbourn ◽  
...  
Keyword(s):  
Field Theory ◽  
Thin Films ◽  
Interface Design ◽  
Photovoltaic Performance ◽  
Mean Field Theory ◽  
Mean Field ◽  
Grazing Incidence ◽  
Interfacial Structure ◽  
Self Consistent Field Theory ◽  
Key Aspects

Abstract Domain composition and interfacial structure are critical factors in organic photovoltaic performance. Here, we report neutron reflectivity, grazing-incidence X-ray diffraction and atomic force microscopy measurements of polymer/fullerene thin-films to test a hypothesis that these partially miscible blends rapidly develop composition profiles consisting of co-existing phases in liquid-liquid equilibrium. We study a range of polymer molecular weights between 2 and 300 kg mol−1, annealing temperatures between 120 and 170 oC, and timescales up to 10 min, yielding over 50 distinct measurement conditions. Model bilayers of fullerene-derivatives and polystyrene enable a rigorous examination of theoretical predictions of the effect of polymer mass and interaction parameter on the compositions, ϕ, and interfacial width, w, of the coexistent phases. We independently measure ϕ and w and find that both Flory-Huggins mean-field-theory and key aspects of self-consistent-field-theory are remarkably consistent with experiment. Our findings pave the way for predictive composition and interface design in organic photovoltaics based on simple experimental measurements and equilibrium thermodynamic theory.

Two-State Mean-Field Theory of Reentrant Phase Transitions

1985 ◽  
Vol 128 (1) ◽  
pp. 169-175 ◽  
Author(s):  
G. F. Kventsel ◽  
J. Katriel
Keyword(s):  
Field Theory ◽  
Phase Transitions ◽  
Mean Field Theory ◽  
Mean Field
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