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

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

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.

RANDOM SURFACE ANISOTROPY AND THE MAGNETIZATION OF EPITAXIALLY GROWN THIN FILMS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1695-C8-1696 ◽  
Author(s):  
J. R. Cullen ◽  
K. B. Hathaway
Keyword(s):  
Thin Films ◽  
Surface Anisotropy ◽  
Random Surface

A method for measuring exchange stiffness in ferromagnetic films

2011 ◽  
Vol 109 (7) ◽  
pp. 07B765 ◽  
Author(s):  
Erol Girt ◽  
W. Huttema ◽  
O. N. Mryasov ◽  
E. Montoya ◽  
B. Kardasz ◽  
...  
Keyword(s):  
Ferromagnetic Films

scholarly journals Route towards efficient magnetization reversal driven by voltage control of magnetic anisotropy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Roxana-Alina One ◽  
Hélène Béa ◽  
Sever Mican ◽  
Marius Joldos ◽  
Pedro Brandão Veiga ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Random Access ◽  
Low Power Consumption ◽  
Surface Anisotropy ◽  
Magnetization Dynamics ◽  
Storage Density ◽  
Switching Regime ◽  
Major Interest ◽  
Out Of Plane

AbstractThe voltage controlled magnetic anisotropy (VCMA) becomes a subject of major interest for spintronics due to its promising potential outcome: fast magnetization manipulation in magnetoresistive random access memories with enhanced storage density and very low power consumption. Using a macrospin approach, we carried out a thorough analysis of the role of the VCMA on the magnetization dynamics of nanostructures with out-of-plane magnetic anisotropy. Diagrams of the magnetization switching have been computed depending on the material and experiment parameters (surface anisotropy, Gilbert damping, duration/amplitude of electric and magnetic field pulses) thus allowing predictive sets of parameters for optimum switching experiments. Two characteristic times of the trajectory of the magnetization were analyzed analytically and numerically setting a lower limit for the duration of the pulses. An interesting switching regime has been identified where the precessional reversal of magnetization does not depend on the voltage pulse duration. This represents a promising path for the magnetization control by VCMA with enhanced versatility.

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