Modifications in magnetic anisotropy of M—type strontium hexaferrite crystals by swift heavy ion irradiation.

Kaur, Balwinder; Bhat, Monita; Licci, F.; Kumar, Ravi; Kulkarni, S.D.; Joy, P.A.; Bamzai, K. K.; Kotru, P. N.

doi:10.1016/j.jmmm.2006.01.110

Cited by 42 publications

(18 citation statements)

References 75 publications

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“…9,10 In the present study, a family of Gasubstituted cobalt ferrite CoGa x Fe 2−x O 4 samples has been investigated. Ga 3+ is known to prefer the tetrahedral sites, 11,12 therefore the results were expected to be different from those of Mn-and Cr-substituted cobalt ferrites.…”

Section: Introductionmentioning

confidence: 92%

Magnetic and magnetoelastic properties of Ga-substituted cobalt ferrite

Song

Lee

et al. 2007

Journal of Applied Physics

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Magnetic and magnetoelasticproperties of a series of Ga-substituted cobaltferrites,CoGaxFe2−xO4 (x=0.0-0.8), have been investigated. The Curie temperatureTCand hysteresis properties were found to vary with gallium content (x), which indicates that exchange and anisotropy energies changed as a result of substitution of Ga for Fe. The maximum magnitude of magnetostriction decreased monotonically with increasing gallium content over the range x=0.0-0.8. The rate of change of magnetostriction with applied magnetic field (dλ/dH) showed a maximum value of 3.2×10−9A−1m for x=0.2. This is the highest value among recently reported cobaltferrite based materials. It was found that the dependence of magnetic and magnetoelasticproperties on the amount of substituent (x) was different for Mn, Cr, and Ga. This is considered to be due to the differences in cation site occupancy preferences of the elements within the spinel crystal structure: Mn3+ and Cr3+ prefer the octahedral (B) sites, whereas Ga3+ prefers the tetrahedral (A) sites. KeywordsAmes Laboratory, CNDE, Cobalt, Ferrites, Magnetostriction, Magnetic anisotropy, Curie point Disciplines Materials Science and Engineering CommentsThe following appeared in Journal of Applied Physics 101 ( Magnetic and magnetoelastic properties of a series of Ga-substituted cobalt ferrites, CoGa x Fe 2−x O 4 ͑x = 0.0-0.8͒, have been investigated. The Curie temperature T C and hysteresis properties were found to vary with gallium content ͑x͒, which indicates that exchange and anisotropy energies changed as a result of substitution of Ga for Fe. The maximum magnitude of magnetostriction decreased monotonically with increasing gallium content over the range x = 0.0-0.8. The rate of change of magnetostriction with applied magnetic field ͑d / dH͒ showed a maximum value of 3.2ϫ 10 −9 A −1 m for x = 0.2. This is the highest value among recently reported cobalt ferrite based materials. It was found that the dependence of magnetic and magnetoelastic properties on the amount of substituent ͑x͒ was different for Mn, Cr, and Ga. This is considered to be due to the differences in cation site occupancy preferences of the elements within the spinel crystal structure: Mn 3+ and Cr 3+ prefer the octahedral ͑B͒ sites, whereas Ga 3+ prefers the tetrahedral ͑A͒ sites.

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Section: Introductionmentioning

confidence: 92%

Magnetic and magnetoelastic properties of Ga-substituted cobalt ferrite

Song

Lee

et al. 2007

Journal of Applied Physics

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“…In view of the technological significance and the large volume of the market, many attempts have been made to improve the key magnetic properties by various methods such as doping [4,5], heat-treatment [6], SiO 2 addition [7], ion irradiation [8], etc. Doping on the Fe [4,9] or Ba/Sr [10,11] lattices was expected to improve the magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and magnetic microstructure of La + Co doped strontium hexaferrites

Pang

Zhang

Ding

et al. 2010

Journal of Alloys and Compounds

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“…The M-type hexagonal unit cell contains two formula units and is made of 10 oxygen layers. It can be described as RSR*S*, where R is a three oxygen layer block comprising of (Ba 2+ or Sr 2+ Fe 6 3+ O 11 ) 2− , while S block contains (Fe 6 3+ O 8 ) 2+ and the R* and S* indicate the blocks obtained by rotating S and R through 180 • around the c-axis [13]. The magnetic properties of the hexagonal ferrites are strongly dependent upon the synthesis conditions and the site preference of the substituted cations among the five different Fe 3+ sublattices namely, tetrahedral (4f 1 ), trigonal bipyramidal (2b) and octahedral (12k, 2a and 4f 2 ) of hexagonal structure [14].…”

Section: Introductionmentioning

confidence: 99%