Distribution of anisotropy field in recording media deduced from the hysteresis curve

1997 ◽  
Vol 81 (8) ◽  
pp. 3794-3796 ◽  
Author(s):  
G. Bottoni ◽  
D. Candolfo ◽  
A. Cecchetti
Keyword(s):  
Anisotropy Field ◽  
Hysteresis Curve ◽  
Recording Media

Hysteresis Modeling of Bonded Anisotropic Ferrite Magnets

2018 ◽  
Vol 912 ◽  
pp. 102-105
Author(s):  
Marcos Flavio de Campos ◽  
Daniel Rodrigues ◽  
Mara Carolina do Carmo Paresque ◽  
Jose Adilson de Castro
Keyword(s):  
Crystallographic Texture ◽  
Anisotropy Field ◽  
Strontium Ferrite ◽  
Hysteresis Curve ◽  
Hysteresis Curves ◽  
Hysteresis Modeling ◽  
Bonded Magnet

The modeling of hysteresis curves of bonded ferrite magnets is discussed. Hysteresis of anisotropic magnets were calculated according to the Stoner-Wohlfarth Model, for the cosn (theta) distribution. The crystallographic texture has significant effect on the hysteresis curve. Two different samples were examined, one isotropic and another anisotropic. The anisotropy field of strontium ferrite magnets was determined to be 19.5 kOe. The Mr/Ms ratio of the anisotropic bonded magnet was estimated as 0.8.

Theoretical Research on Microwave Assisted Magnetic Moment Reversal in Magnetic Recording Media

2012 ◽  
Vol 152-154 ◽  
pp. 162-166
Author(s):  
Shuang Mei Li
Keyword(s):  
Magnetic Recording ◽  
Magnetic Moment ◽  
Anisotropy Field ◽  
Theoretical Research ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Interacting Particles ◽  
Switching Field ◽  
Switching Speed ◽  
Microwave Assisted

The minimum switching field threshold and switching speed are key parameters for the magnetic recording in writing. This paper presents the dynamic precession of the moments of the grains based on LL equation.Under microwave-assisted reversal conditions, the influence of the differences between the angle of Anisotropy field on the magnetic moment reversal and loading speed of reversal magnetic field in two interacting particles is investigated.

Estimate of the Anisotropy Field of Strontium Ferrite from Powders Using the Stoner-Wohlfarth Model

2016 ◽  
Vol 881 ◽  
pp. 128-133
Author(s):  
Marcos Flavio de Campos ◽  
Sergio A. Romero ◽  
Daniel Rodrigues
Keyword(s):  
Anisotropy Field ◽  
Strontium Ferrite ◽  
Hysteresis Curve ◽  
Vibrating Sample Magnetometer ◽  
Powder Samples

The isotropic Stoner-Wohlfarth model can be applied for the determination of the anisotropy field in powders. Samples of strontium ferrite - SrFe12O19 – were measured in Vibrating Sample Magnetometer (VSM). By means of the fitting of the first quadrant of the hysteresis curve the anisotropy field was estimated as 19-20 kOe for the SrFe12O19 phase. The main advantage of the method is its simplicity, because compacting or sintering of the powder samples is not necessary

Effect of anisotropy field of soft magnetic underlayer on read/write properties in perpendicular recording media

2003 ◽  
Vol 93 (10) ◽  
pp. 7744-7746 ◽  
Author(s):  
Y. Nakatani ◽  
N. Hayashi ◽  
Y. Uesaka ◽  
H. Fukushima
Keyword(s):  
Anisotropy Field ◽  
Recording Media ◽  
Soft Magnetic ◽  
Perpendicular Recording
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