Influence of the surface anisotropy on the ground state of thin ferromagnetic films

1980 ◽  
Vol 23 (7) ◽  
pp. 612-616
Author(s):  
D. I. Sementsov ◽  
V. A. Syabro
Keyword(s):  
Ground State ◽  
Surface Anisotropy ◽  
Ferromagnetic Films

ON THE ZERO THICKNESS LIMIT OF THIN FERROMAGNETIC FILMS WITH SURFACE ANISOTROPY ENERGY

2001 ◽  
Vol 11 (08) ◽  
pp. 1469-1490 ◽  
Author(s):  
K. HAMDACHE ◽  
M. TILIOUA
Keyword(s):  
Maxwell Equations ◽  
Existence Of Solutions ◽  
Anisotropy Energy ◽  
Surface Anisotropy ◽  
Magnetic Polarization ◽  
One Dimensional ◽  
Ferromagnetic Films ◽  
Lifshitz Equation ◽  
Global Existence Of Solutions ◽  
Model Equations

We discuss the behaviour, when the thickness ε tends to 0, of thin ferromagnetic films with surface anisotropy energy. The model equations are given by the Landau–Lifshitz equation coupled to Maxwell equations with magnetic polarization. We consider two types of materials: flat and slender cylinders. Two scalings for the surface anisotropy coefficient are used. In the first one it is assumed that the coefficient is of order ε while in the second one we suppose that it is of order 1. We prove global existence of solutions and show that the zero-thickness limit induces new effects. For example, for slender media we get a nonlocal effect for the magnetic excitation while for flat media we obtain a one-dimensional magnetic field.

Origin of the Magnetic "Surface Anisotropy" of Thin Ferromagnetic Films

1971 ◽  
Vol 3 (5) ◽  
pp. 1642-1649 ◽  
Author(s):  
Alan J. Bennett ◽  
Bernard R. Cooper
Keyword(s):  
Magnetic Surface ◽  
Surface Anisotropy ◽  
Ferromagnetic Films

Crossover in the surface anisotropy contributions of ferromagnetic films on rippled Si surfaces

2013 ◽  
Vol 87 (2) ◽  
Author(s):  
M. O. Liedke ◽  
M. Körner ◽  
K. Lenz ◽  
M. Fritzsche ◽  
M. Ranjan ◽  
...  
Keyword(s):  
Surface Anisotropy ◽  
Ferromagnetic Films

Renilla Bioluminescence: A Morphologic Approach to the Location of Photocytes

1974 ◽  
Vol 32 ◽  
pp. 208-209
Author(s):  
Ben O. Spurlock ◽  
Milton J. Cormier
Keyword(s):  
Excited State ◽  
Ground State ◽  
Molecular Basis ◽  
Light Emission ◽  
Chemical Basis ◽  
Electronic Excited State ◽  
Colonial Form ◽  
The Common ◽  
Eighteenth And Nineteenth Centuries ◽  
Catalyzed Oxidation

The phenomenon of bioluminescence has fascinated layman and scientist alike for many centuries. During the eighteenth and nineteenth centuries a number of observations were reported on the physiology of bioluminescence in Renilla, the common sea pansy. More recently biochemists have directed their attention to the molecular basis of luminosity in this colonial form. These studies have centered primarily on defining the chemical basis for bioluminescence and its control. It is now established that bioluminescence in Renilla arises due to the luciferase-catalyzed oxidation of luciferin. This results in the creation of a product (oxyluciferin) in an electronic excited state. The transition of oxyluciferin from its excited state to the ground state leads to light emission.

Electron Microscope Observations of Magnetic and Electric Effects

1970 ◽  
Vol 28 ◽  
pp. 430-431
Author(s):  
John Silcox
Keyword(s):  
Electron Microscope ◽  
Electric Fields ◽  
Magnetic Image ◽  
Magnetic Effects ◽  
Ferromagnetic Films ◽  
Diffraction Contrast ◽  
Microscope Images ◽  
Electric Effects ◽  
Image Detail

Several aspects of magnetic and electric effects in electron microscope images are of interest and will be discussed here. Clearly electrons are deflected by magnetic and electric fields and can give rise to image detail. We will review situations in ferromagnetic films in which magnetic image effects are the predominant ones, others in which the magnetic effects give rise to rather subtle changes in diffraction contrast, cases of contrast at specimen edges due to leakage fields in both ferromagnets and superconductors and some effects due to electric fields in insulators.

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