scholarly journals Experimental Verification of Isotropic and Anisotropic Anhysteretic Magnetization Models

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1549 ◽  
Author(s):  
Michał Nowicki ◽  
Roman Szewczyk ◽  
Paweł Nowak
Keyword(s):  
Magnetic Materials ◽  
Experimental Verification ◽  
Magnetization Curve ◽  
Magnetic Hysteresis ◽  
Uniaxial Anisotropy ◽  
Hysteresis Loops ◽  
Anisotropic Energy ◽  
Magnetic Hysteresis Loops ◽  
Anhysteretic Magnetization ◽  
Soft Ferrite

The anhysteretic magnetization curve is the key element of modeling magnetic hysteresis loops. Despite the fact that it is intensively exploited, known models of anhysteretic curve have not been verified experimentally. This paper presents the validation of four anhysteretic curve models considering four different materials, including isotropic, such as Mn-Zn soft ferrite, as well as anisotropic amorphous and nanocrystalline alloys. The presented results indicate that only the model that considers anisotropic energy is valid for a wide set of modern magnetic materials. The most suitable of the verified models is the anisotropic extension function-based model, which considers uniaxial anisotropy.

Magnetostatic Interactions of Two-Dimensional Arrays of Magnetic Strips

2010 ◽  
Vol 1250 ◽  
Author(s):  
Leszek Mariusz Malkinski ◽  
Minghui Yu ◽  
Donald Scherer II
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Hysteresis ◽  
Resonance Field ◽  
Uniaxial Anisotropy ◽  
Hysteresis Loops ◽  
Resonant Peak ◽  
Magnetic Hysteresis Loops ◽  
Lift Off ◽  
Magnetostatic Modes ◽  
Magnetostatic Interactions

AbstractA series of arrays consisting of Permalloy stripes with dimensions of 100 nm × 300 nm × 1500 nm was fabricated using electron beam nanolithography and magnetron sputtering followed by the lift-off process. In order to elucidate the effect of magnetostatic interactions among nanosized stripes on magnetic properties of the arrays, the separation between the stripes in different arrays was varied in the range between 100 nm and 2000 nm. Magnetic hysteresis loops of the arrays were measured using SQUID magnetometer for different orientations of the applied field with respect to the arrays. Magnetic anisotropy of the arrays was determined based on ferromagnetic resonance measurements at 9.8 GHz using EPR spectrometer. The measurements were carried out for different directions of in-plane magnetic bias filed. The angular dependence of the resonance field of the main resonant peak indicated presence of the uniaxial magnetic anisotropy due to elongated shape of the stripes. Comparison between angular curves of resonant fields for different arrays leads to the conclusion that increasing strength of magnetostatic interactions among the stripes leads to a suppression of the uniaxial anisotropy. The stripes separated by 2000 nm behave almost like non-interacting objects, but the effect of interactions becomes particularly significant for separations smaller than 600 nm. The properties of the arrays with the smallest separations resembled those of continuous films. Magnetostatic modes have been observed in the FMR spectra in addition to the main resonant peak. These modes are believed to result from dimensional confinement of lateral spinwaves in the magnetic stripes. No such modes were observed in the reference samples of solid Py films, with the in-plane applied magnetic field.

scholarly journals A laboratory magnetometer for express measurements of magnetic hysteresis loops

2021 ◽  
Vol 26 (2) ◽  
pp. 32-36
Author(s):  
K. Sova ◽  
◽  
A. Vakula ◽  
S. Polevoy ◽  
S. Tarapov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
External Magnetic Field ◽  
Magnetic Materials ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Storage Conditions ◽  
Field Method ◽  
Magnetic Nanomaterials ◽  
Magnetic Hysteresis Loops

Subject and Purpose. The development of technologies for synthesis of nanoscale magnetic materials requires new techniques for measuring magnetic properties of nanoscale magnetic materials in such a way as to provide express post-synthesis measurements of magnetic properties and exclude, in doing so, any mechanical displacements of measured specimens. Despite the fact that numerous techniques exist for studying magnetic properties of materials, the development of such magnetic nanomaterials as magnetic nanoparticles faces the need in novel measuring approaches based on standard procedures. Novel express techniques are called to gain information about how magnetic properties of magnetic materials vary over time and respond to such factors as temperature, storage conditions, stabilizing agents, exposure to an external magnetic field. Method and Methodology. In this work, magnetic hysteresis loops are registered using a newly developed technique based on the method of small disturbances (by an external magnetic field) and combining standard constructions of hysterometers and vibrating-sample magnetometers. Results. Magnetic hysteresis loops of a bulky ferrite (brand 1SCh4) sample and a 40 μm thick YIG film have been registered using the presented technique and compared with the results obtained by the well-known technique for measuring magnetic hysteresis loops. They are in good agreement with a margin error as low as 10%, which can be further improved by means of more precise equipment. With the presented technique, the magnetization and the coercive force of Fe0.5Co0.5Fe2O4 nanoparticles not examined yet have been determined. Conclusion. The developed technique makes it possible to study magnetic materials of various compositions including nanoscale magnets.

Simulations of magnetic hysteresis loops at high temperatures

2014 ◽  
Vol 116 (12) ◽  
pp. 123910 ◽  
Author(s):  
M. L. Plumer ◽  
J. van Ek ◽  
J. P. Whitehead ◽  
T. J. Fal ◽  
J. I. Mercer
Keyword(s):  
High Temperatures ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Magnetic Hysteresis Loops
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