Effect of the cation site occupancy on the magnetization reversal mechanism of hydrothermal barium ferrites

Speliotis, D.; Morrish, A. H.; Pankhurst, Quentin A.; Zhou, Xuezhi; Bottoni, G.; Candolfo, D.; Cecchetti, A.; Mazoli, F.

doi:10.1109/20.92090

Cited by 28 publications

(14 citation statements)

References 11 publications

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“…The 4 f IV and 2a sites seem not to be occupied by Zn-Zr ions from xϭ0 to xϭ1.6. The site occupancies are similar to the Co-Ti, 16,19 Co-Sn, 17 and Co-Mo 20 substitutions in BaM ferrite. Obradors et al 21 have proposed that the 2b site can display a pseudotetrahedral character; hence, it is very possible for the Zn 2ϩ ions to occupy the 2b site.…”

Section: B Mössbauer Spectrasupporting

confidence: 54%

Site preference and magnetic properties for a perpendicular recording material: BaFe_{12-x}Zn_{x/2}Zr_{x/2}O_{19} nanoparticles

et al. 2000

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The site preference and magnetic properties of Zn-Zr substituted BaM ferrite BaFe 12Ϫx Zn x/2 Zr x/2 O 19 nanoparticles with xϭ0 -1.6 have been studied using Mössbauer spectra and magnetic measurement. The results show that the magnetizations and magnetocrystalline anisotropies are closely related to the distributions of Zn-Zr ions on the five sites. The BaFe 12Ϫx Zn x/2 Zr x/2 O 19 nanoparticles exhibit unusual saturation magnetization, which increase at low substitutions, reach a maximum and then decrease. Mössbauer spectra show that the Zn-Zr ions preferentially occupy the 2b and 4 f VI sites. The preference for the 4 f VI site is responsible for the anomalous increase in the magnetization at low Zn-Zr substitutions. At xу1.2 the rapid decrease in the magnetizations is mainly attributed to a noncollinear magnetic structure. In addition, a monotonic decrease in the magnetocrystalline anisotropy with Zn-Zr substitutions has its origin in the preference of the Zn-Zr ions for the 2b and 4 f VI sites.

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Section: B Mössbauer Spectrasupporting

confidence: 54%

Site preference and magnetic properties for a perpendicular recording material: BaFe_{12-x}Zn_{x/2}Zr_{x/2}O_{19} nanoparticles

et al. 2000

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“…Furthermore Nd, which varies only with the shape of the particles, lies within a small range. Therefore it is expected that H, will drop as x increases mainly through the anisotropy, K. On the other hand, incoherent magnetization reversals may also decrease H, [15,16].…”

Section: Resultsmentioning

confidence: 99%

Site preference for Co/sup 2+/ and Ti/sup 4+/ in Co-Ti substituted barium ferrite

Zhou

Morrish

et al. 1991

IEEE Trans. Magn.

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Co2+ and Ti4+ substituted M-type barium ferrite, BaFe~z-zxCo,TixOl~, with x from 0 to 0.9 has been prepared using a modified ceramic method and investigated by electron microscopy, vibrating sample magnetometry and Mossbauer spectroscopy. Results show that Coz+ and Ti4+ cations prefer to occupy the 4fv1 and 2b crystallographic sites, with 4fw and 2a sites are only slightly involved as well for x > O.G. These site preferences will significantly weaken the uniaxial anisotropy of this material which is attributed to the contribution of iron ions at the 2b and 4fvl sites. As a consequence, the coercive force of BaFe~z-zxCo,TixOl~ drastically decreases and the magnetization remains almost a constant as x increases.

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“…3 and 4, the calculated field dependences of peak-to-peak torque (Tp-p) valces are dependent on the sample's easy-axis orientation and the initial magnetic state. It is observed that for fields of less than Hkl2, Tp-p values are determined by whether the initial state is the remanent or demagnetized state, and become independent of the initial state at fields greater than Hk/2.…”

Section: Resultsmentioning

confidence: 99%

“…The magnetization reversal process in barium ferrite particulate media was previously reported to proceed by incoherent rotation [1]- [3]. In our previous work [4], coercivities were measured in c-axis uniaxially in-plane aligned barium ferrite thin films, and were shown to follow a nonmonotonic angular dependence.…”

Section: Introductionmentioning

confidence: 99%

Incoherent rotation in barium ferrite thin film recording media

et al. 1997

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The angular dependence of the remanent magnetic properties of uniaxially in-plane oriented barium ferrite films were found to deviate significantly from the Stoner-Wohlfarth (SW) coherent rotation model. The in-plane torque and the rotational hysteresis were studied in both aligned and randomly oriented films. They were found to be different from that calculated from the SW coherent rotation model, and suggested incoherent rotation of magnetization during the switching process. Incoherent rotation was found to be dependent on grain size and intergranular interactions.

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Effect of the cation site occupancy on the magnetization reversal mechanism of hydrothermal barium ferrites

Cited by 28 publications

References 11 publications

Site preference and magnetic properties for a perpendicular recording material: BaFe_{12-x}Zn_{x/2}Zr_{x/2}O_{19} nanoparticles

Site preference and magnetic properties for a perpendicular recording material: BaFe_{12-x}Zn_{x/2}Zr_{x/2}O_{19} nanoparticles

Site preference for Co/sup 2+/ and Ti/sup 4+/ in Co-Ti substituted barium ferrite

Incoherent rotation in barium ferrite thin film recording media

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