Relationship between coercive force and anisotropy field for oriented barium ferrite tapes and magnets

1978 ◽  
Vol 49 (3) ◽  
pp. 1823-1825 ◽  
Author(s):  
R. E. Fayling
Keyword(s):  
Coercive Force ◽  
Barium Ferrite ◽  
Anisotropy Field

RELATION OF COERCIVE FORCE TO STRUCTURAL PROPERTIES OF ELECTROPLATED FILMS

1962 ◽  
Vol 40 (4) ◽  
pp. 454-462 ◽  
Author(s):  
J. C. Lloyd ◽  
R. S. Smith
Keyword(s):  
Crystal Growth ◽  
Coercive Force ◽  
Structural Properties ◽  
Applied Stress ◽  
Crystal Orientation ◽  
Anisotropy Field ◽  
Preferred Orientation ◽  
Moderate Growth ◽  
Smith Model

Coercive forces (He) of Fe–Ni films were observed to depend on thickness, Fe/Ni ratio, and preferred crystal orientation in accordance with predictions based on the Behringer–Smith model. Annealing induces marked crystal growth and orientation of [111] axis normal to the plane in the Ni-rich films (> 80% Ni), but only moderate growth in the Fe-rich (< 80% Ni) films. He for Ni-rich films increases markedly while He for iron-rich films decreases slightly due to annealing. Variations of the anisotropy field, Hk, due to applied stress, indicate that reduction of He for the Fe-rich films results from moderate crystal growth while the increase of He for the Ni-rich films is due to the preferred orientation.

Effects of Magnetic Powder Loading on Mechanical Properties and Magnetic Properties of Natural Rubber

2006 ◽  
Vol 45 ◽  
pp. 1423-1428
Author(s):  
Somsak Woramongconchai ◽  
Chatchawan Lohitvisat ◽  
Aree Wichainchai
Keyword(s):  
Mechanical Properties ◽  
Magnetic Properties ◽  
Coercive Force ◽  
Natural Rubber ◽  
Barium Ferrite ◽  
Maximum Energy ◽  
Magnetic Powder ◽  
Elongation At Break ◽  
Maximum Energy Product ◽  
Energy Product

The effect of magnetic powders and powders loading on magnetic properties and mechanical properties of magnetic rubbers were studied. The natural rubber with magnetic powders, Barium ferrite, Neodymium iron boron, were used as starting materials to prepare magnetic rubbers. Barium ferrite (BaO.6F2O3) powders had been sintered at 1285 oC for 30 hours to improve its crystal structure. The physical properties of magnetic rubbers, residual flux density (Br), coercive force (Hc), maximum energy product (BHmax), hardness and density, had a trend to increase as enhancing magnetic powders loading. However, some properties such as, intrinsic coercive force (Hci), tensile strength and elongation at break, had a trend to decrease when the magnetic powder loading was increased. Magnetic properties of the anisotropic type, sintered powders, were higher than isotropic type, non-sintered powders, except the Hci because anisotropic magnetic rubber indicated crystal orientation in the same direction.

Stoner-Wohlfarth Model for Nanocrystalline Anisotropic Sm2Co17 Magnets

2014 ◽  
Vol 775-776 ◽  
pp. 431-436 ◽  
Author(s):  
Marcos Flavio de Campos ◽  
Fernanda A.S. da Silva ◽  
José Adilson de Castro
Keyword(s):  
Coercive Force ◽  
Anisotropy Field ◽  
Hysteresis Curves ◽  
Isotropic Magnet

The Stoner-Wohlfarth model can be used for predicting hysteresis curves of either isotropic or anisotropic nanocrystalline Sm2Co17 type magnets. For isotropic magnets, with Mr/Ms=0.5, the Stoner-Wohlfarth model predicts coercive force of 48% of the anisotropy field. Here, Mr is remanence and Ms is magnetization of saturation. Two texture distributions were compared: Pearson VII and cosn. The calculations indicate that increasing the alignment degree of the grains, the coercivity increases. However, this increase of the coercive force is small. It is found that a very well aligned magnet, with Mr/Ms ratio of 0.96, presents coercivity only ~20% higher than that of the isotropic magnet.

scholarly journals A Neutron Diffraction Investigation of High Valent Doped Barium Ferrite With Super-wide Tunable Microwave Absorption

2021 ◽  
Author(s):  
J. Li ◽  
Yang Hong ◽  
San He ◽  
Weike Li ◽  
Han Bai ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Microwave Absorption ◽  
Barium Ferrite ◽  
Sol Gel ◽  
Double Resonance ◽  
Low Frequency ◽  
Anisotropy Field ◽  
Wide Band ◽  
Crystal Anisotropy ◽  
High Valent

Abstract The Barium ferrite BaTixFe12-xO19 (x = 0.2, 0.4, 0.6, 0.8) ceramics doped by Ti4+ (BFTO-x) were synthesized by a modified sol-gel method. The crystal structure and magnetic structure of the samples were determined by neutron diffraction, and confirm that the BFTO-x ceramics were high quality single phase with sheet micro-structure. With x increasing from 0.2 to 0.8, the Ms decreases gradually but the change of Hc is complex under the synergy of the changed grain size and the magnetic crystal anisotropy field. Relying on the high valence of Ti4+, double resonance peaks are obtained in the curves of μ′′ and the resonance peaks could move towards the low frequency with the increase of x, which facilitate the samples perform an excellent wide-band modulation microwave absorption property. In the x = 0.2 sample, the maximum reflection loss can reach –44.9 dB at the thickness of only 1.8 mm, and the bandwidth could reach to 5.28 GHz at 2 mm when the RL is less than –10 dB. All the BFTO-x ceramics show excellent frequency modulation ability varying from 18 GHz (x = 0.8) to 4 GHz (x = 0.4), which covers 81% of the investigated frequency in microwave absorption field.

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