Magnetic properties of nanocrystalline barium hexaferrite powders: anisotropy field and interaction effects

Magnetic properties of Co, Ni and Zn substituted barium hexaferrite (BaM) samples prepared by solid state ceramic method were studied. Saturation magnetisation were found higher for Zn-substituted BaM, whereas, coercivity is higher for Co2+ and Ni2+ ion substituted samples. Anisotropy field for all substituted samples was calculated by the law of approaching saturation. Remanence, squareness and thermomagnetic plot suggest Zn2+ ions restricts the magnetic interaction of various sites in BaM.

Download Full-text

Structural and Magnetic Properties of Nanosized Barium Hexaferrite Powders Obtained by Microemulsion Technique

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.159.57 ◽

2010 ◽

Vol 159 ◽

pp. 57-62 ◽

Cited By ~ 7

Author(s):

Tatyana Koutzarova ◽

Svetoslav Kolev ◽

Kornely Grigorov ◽

Chavdar Ghelev ◽

Andrzej Zaleski ◽

...

Keyword(s):

Magnetic Properties ◽

Cetyltrimethylammonium Bromide ◽

Room Temperature ◽

Average Particle Size ◽

Barium Hexaferrite ◽

Anisotropy Field ◽

Microemulsion System ◽

Average Particle ◽

Crystalline Anisotropy ◽

Magneto Crystalline Anisotropy

Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were studied. A water-in-oil reverse microemulsion system with cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, n-butanol as a co-surfactant, n-hexanol as a continuous oil phase, and an aqueous phase were used. The microstructural and magnetic properties were investigated. The particles obtained were mono-domain with average particle size 280 nm. The magnetic properties of the powder were investigated at 4.2 K and at room temperature. The saturation magnetization was 48.86 emu/g and the coercivity, 2.4 x 105 A/m at room temperature. The anisotropy field Ha and magneto-crystalline anisotropy K1 were 1.4 x 106 A/m and 2.37 x 105 J/m3, respectively.

Download Full-text

THE SOL–GEL SYNTHESIS OF RARE-EARTH IONS SUBSTITUTED BARIUM HEXAFERRITES AND MAGNETIC PROPERTIES

Modern Physics Letters B ◽

10.1142/s0217984913501923 ◽

2013 ◽

Vol 27 (26) ◽

pp. 1350192 ◽

Cited By ~ 2

Author(s):

S. CAI ◽

P. H. XIN ◽

P. F. WANG ◽

B. B. ZHANG ◽

Y. B. HAN ◽

...

Keyword(s):

Magnetic Properties ◽

Rare Earth ◽

Magnetic Moments ◽

Sol Gel ◽

Barium Hexaferrite ◽

Anisotropy Field ◽

Average Diameter ◽

Rare Earth Ions ◽

Barium Hexaferrites ◽

The Rare Earth

In this paper, a series of rare-earth-doped barium hexaferrite powders ( Ba 0.95 Re 0.05- Fe 12 O 19 and Ba 0.95 Re 0.05 M 0.05 Fe 11.95 O 19: Re = La , Pr , Sm , Nd , Gd , Dy , Yb ; M = Zn 2+, Mn 2+, [Formula: see text]) were synthesized by the sol–gel self-combustion technology. The phase composition and the magnetic properties of the as-prepared barium hexaferrites were characterized and discussed with X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The results showed that the barium hexaferrites exhibited the magnetoplumbite phase structure with the average diameter of 45 nm. Magnetic properties study revealed that the variation of the saturation magnetization (Ms) was similar with the change of the rare-earth ions radius, but the change of Ms was low. This indicated that the magnetic moments of rare-earth ions could not affect Ms. The magnetocrystalline anisotropy field mainly influenced the anisotropism of hexaferrites, and the coercivity (Hc) of the rare-earth ions doped barium hexaferrites basically decreased with the increasing orbital quantum numbers (except Sm 3+ and Gd 3+). Further study showed the co-addition of Zn 2+ and Mn 2+ did not change the trend of Ms and Hc. Thus, it is concluded that the rare-earth ions played an important role for the anisotropy field of barium hexaferrites.

Download Full-text

INTERACTION EFFECTS ON THE MAGNETIC PROPERTIES OF TRANSITION IMPURITIES IN NOBLE METALS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1971155 ◽

1971 ◽

Vol 32 (C1) ◽

pp. C1-172-C1-178 ◽

Cited By ~ 12

Author(s):

J. SOULETIE ◽

R. TOURNIER

Keyword(s):

Magnetic Properties ◽

Noble Metals ◽

Interaction Effects

Download Full-text

Crystal structure and magnetic properties study on barium hexaferrite (BHF) and cobalt zinc ferrite (CZF) in composites

Solid State Sciences ◽

10.1016/j.solidstatesciences.2020.106529 ◽

2021 ◽

Vol 113 ◽

pp. 106529

Author(s):

Murli Kumar Manglam ◽

Jyotirekha Mallick ◽

Suman Kumari ◽

Rabichandra Pandey ◽

Manoranjan Kar

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Zinc Ferrite ◽

Barium Hexaferrite ◽

Cobalt Zinc Ferrite

Download Full-text

Crystal structure and magnetic properties study on barium hexaferrite of different average crystallite size

Applied Physics A ◽

10.1007/s00339-020-04232-8 ◽

2021 ◽

Vol 127 (2) ◽

Author(s):

Murli Kumar Manglam ◽

Suman Kumari ◽

Jyotirekha Mallick ◽

Manoranjan Kar

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Crystallite Size ◽

Barium Hexaferrite ◽

Average Crystallite Size

Download Full-text

Effect of Thickness on Mechanically Tunable Magnetic Anisotropy of FeGa Thin Films Deposited on Flexible Substrates

Materials Science Forum ◽

10.4028/www.scientific.net/msf.815.227 ◽

2015 ◽

Vol 815 ◽

pp. 227-232 ◽

Cited By ~ 2

Author(s):

Ying Yu ◽

Shu Hong Xie ◽

Qing Feng Zhan

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Magnetic Anisotropy ◽

Effective Strain ◽

Anisotropy Field ◽

Saturation Field ◽

Effective Anisotropy ◽

Magnetostriction Constant ◽

The Difference ◽

Different Strains

A practical way to manipulate the magnetic anisotropy of magnetostrictive FeGa thin films grown on flexible polyethylene terephthalate (PET) substrates is introduced in this study. The effect of film thickness on magnetic properties and magnetostriction constant of polycrystalline FeGa thin films was investigated. The anisotropy field Hk of flexible FeGa films, i.e., the saturation field determined by fitting the hysteresis curves measured along the hard axis, was enhanced with increasing the tensile strain applied along the easy axis of the thin films, but this enhancement via strain became unconspicuous with increasing the thickness of FeGa films. In order to study the magnetic sensitivity of thin films responding to the external stress, we applied different strains on these films and measure the corresponding anisotropy field. Moreover, the effective magnetostriction constant of FeGa films was calculated from the changes of both anisotropy field and external strain based on the Villari effect. A Neel’s phenomenological model was developed to illustrate that the effective anisotropy field of FeGa thin films was contributed from both the constant volume term and the inverse thickness dependent surface term. Therefore, the magnetic properties for the volume and surface of FeGa thin films were different, which has been verified in this work by using vibrating sample magnetometer (VSM) and magneto-optic Kerr effect (MOKE) system. The anisotropy field contributed by the surface of FeGa film and obtained by MOKE is smaller than that contributed by the film volume and measured by VSM. We ascribed the difference in Hk to the relaxation of the effective strain applied on the films with increasing the thickness of films.

Download Full-text