Features of the 180º pulsed magnetization reversal of ferrite-garnet films with biaxial anisotropy in their plane

2016 ◽  
Author(s):  
Матюнин ◽  
Andrey Matyunin ◽  
Николадзе ◽  
Georgiy Nikoladze ◽  
Поляков ◽  
...  
Keyword(s):  
Magnetic Materials ◽  
Magnetization Reversal ◽  
Visual Representation ◽  
Experimental Studies ◽  
Uniaxial Anisotropy ◽  
Ferrite Garnet ◽  
Garnet Films ◽  
First Time ◽  
Nonlinear Magnetization

The calculations and experimental studies have shown that the intensity of nonlinear magnetization oscillations arising during the process of 180 pulsed magnetization reversal of real ferrite-garnet films with biaxial anisotropy weakly depends on the magnetization reversal pulse Hp frontf duration (in contrast to magnetic materials with uniaxial anisotropy). The pulsed magnetization reversalcurve, which provides a visual representation of the magnetization reversal speed saturation caused by the influence of nonlinear magnetization oscillations, analyzed for the first time.

Analysis of In-Plane Anisotropy Influence on Nonlinear Magnetization Oscillations Accompanying 90° Pulsed Reversal Processes in Real Ferrite-Garnet Films

2012 ◽  
Vol 190 ◽  
pp. 589-592 ◽  
Author(s):  
O.S. Kolotov ◽  
A.V. Matyunin ◽  
G.M. Nikoladze ◽  
P.A. Polyakov
Keyword(s):  
Anisotropy Field ◽  
Effective Field ◽  
Ferrite Garnet ◽  
Garnet Films ◽  
Plane Anisotropy ◽  
Nonlinear Magnetization

The possibility of suppression of gyroscopic magnetization oscillations by increasing an effective in-plane anisotropy field is discussed. It is shown that the presence of biaxial anisotropy in real films with the effective field ranging from 10 to 70 Oe should not cause any difficulties at suppressing the oscillations.

scholarly journals Study of torque acting on magnetization during 180° pulsed reversal process in ferrite-garnet films with biaxial anisotropy

2018 ◽  
Vol 185 ◽  
pp. 02008
Author(s):  
Oleg Kolotov ◽  
Andrey Matyunin ◽  
Georgiy Nikoladze ◽  
Petr Polyakov
Keyword(s):  
Magnetization Reversal ◽  
External Fields ◽  
Garnet Film ◽  
Ferrite Garnet ◽  
Garnet Films ◽  
Reversal Process ◽  
Plane Anisotropy ◽  
Magnetization Reversal Process

The mode of 180° a pulsed magnetization reversal process of ferrite-garnet films with in-plane anisotropy in the external fields region, in which the mechanism of the homogeneous rotation of magnetization takes place, was firstly investigated. Analysis of calculated and experimental longitudinal signals showed that the presence of biaxial anisotropy in real ferrite-garnet film leads to the occurrence of nonlinear damped magnetization oscillations (with a period of the main harmonic of ~1.5 ns).

scholarly journals Micromagnetic Simulations of Fe and Ni Nanodot Arrays Surrounded by Magnetic or Non-Magnetic Matrices

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 349
Author(s):  
Devika Sudsom ◽  
Andrea Ehrmann
Keyword(s):  
Magnetic Materials ◽  
Data Storage ◽  
Magnetization Reversal ◽  
Hysteresis Loops ◽  
Object Oriented ◽  
Basic Research ◽  
Memory Systems ◽  
The Other ◽  
Micromagnetic Simulations ◽  
Nanodot Arrays

Combining clusters of magnetic materials with a matrix of other magnetic materials is very interesting for basic research because new, possibly technologically applicable magnetic properties or magnetization reversal processes may be found. Here we report on different arrays combining iron and nickel, for example, by surrounding circular nanodots of one material with a matrix of the other or by combining iron and nickel nanodots in air. Micromagnetic simulations were performed using the OOMMF (Object Oriented MicroMagnetic Framework). Our results show that magnetization reversal processes are strongly influenced by neighboring nanodots and the magnetic matrix by which the nanodots are surrounded, respectively, which becomes macroscopically visible by several steps along the slopes of the hysteresis loops. Such material combinations allow for preparing quaternary memory systems, and are thus highly relevant for applications in data storage and processing.

scholarly journals What voiced obstruents symbolically represent in Japanese: evidence from the Pokémon universe

2021 ◽  
Vol 37 (1) ◽  
pp. 3-24
Author(s):  
Shigeto Kawahara ◽  
Gakuji Kumagai
Keyword(s):  
Experimental Studies ◽  
Sound Symbolism ◽  
Visual Images ◽  
General Issue ◽  
First Time

Abstract Kawahara, Noto, and Kumagai (2018b) found that within the corpus of existing Pokémon names, the number of voiced obstruents in the characters’ names correlates positively with their weight, height, evolution levels and attack values. While later experimental studies to some extent confirmed the productivity of these sound symbolic relationships (e.g. Kawahara and Kumagai 2019a), they are limited, due to the fact that the visual images presented to the participants primarily differed with regard to evolution levels. The current experiments thus for the first time directly explored how each of these semantic dimensions—weight, height, evolution levels, and attack values—correlates with the number of voiced obstruents in nonce names. The results of two judgment experiments show that all of these parameters indeed correlate positively with the number of voiced obstruents in the names. Overall, the results show that a particular class of sounds—in our case, a set of voiced obstruents—can signal different semantic meanings within a single language, supporting the pluripotentiality of sound symbolism (Winter, Pérez-Sobrino, and Brown 2019). We also address another general issue that has been under-explored in the literature on sound symbolism; namely, its cumulative nature. In both of the experiments, we observe that two voiced obstruents evoke stronger images than one voiced obstruent, instantiating what is known as the counting cumulativity effect (Jäger and Rosenbach 2006).

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