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

Li, Z. W.; Ong, C. K.; Zheng, Yuying; Wei, Fulin; Zhou, Xuezhi; Zhao, Jun‐Hui; Morrish, A. H.

doi:10.1103/physrevb.62.6530

Cited by 122 publications

(14 citation statements)

References 34 publications

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“…Because Mo ¨ssbauer spectroscopy also depends on the magnetic environment, it is an important tool for investigating iron containing nanoparticles. 227,239,[257][258][259][260][261][262][263][264] Remarkably, thermal analysis techniques such as thermogravimetric analysis (TGA), differential thermal analysis (DTA), and differential scanning calorimetry (DSC) have been used to determine site occupancies.…”

Section: Site Occupancymentioning

confidence: 99%

Chemically prepared magnetic nanoparticles

Willard¹,

Kurihara²,

Carpenter³

et al. 2004

International Materials Reviews

495

233

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Nanotechnology has spurred efforts to design and produce nanoscale components for incorporation into devices. Magnetic nanoparticles are an important class of functional materials, possessing unique magnetic properties due to their reduced size (below 100 nm) with potential for use in devices with reduced dimensions. Recent advances in processing by chemical synthesis and the characterisation of magnetic nanoparticles are the focus of this review. Emphasis has been placed on the various solution chemistry techniques used to synthesise particles, including: precipitation, borohydride reduction, hydrothermal, reverse micelles, polyol, sol-gel, thermolysis, photolysis, sonolysis, multisynthesis processing and electrochemical techniques. The challenges and methods for examining the structural, morphological, and magnetic properties of these materials are described.

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Section: Site Occupancymentioning

confidence: 99%

Chemically prepared magnetic nanoparticles

Willard¹,

Kurihara²,

Carpenter³

et al. 2004

International Materials Reviews

495

233

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“…The magnetic properties of the substituted hexaferrites are strongly depending on electronic configuration of the substituted cations as well as on their site preference. Several combinations of substituents such as Zn-Zr, Co-Ti, Zn-Ti, Ni-Ti and others have been investigated and reported [6]- [9]. Zn-Nb substituted SrF is a new kind of very promising particulate material for magnetic recording [10].…”

Section: Introductionmentioning

confidence: 99%

Microwave Sintering of Zn-Nb Doped Barium Hexaferrite Synthesized via Sol-Gel Method

Kanagesan¹,

Hashim²,

Jesurani³

et al. 2014

MSA

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A series of polycrystalline M-type hexagonal ferrites with the formula BaFe12−2xZnx NbxO19 (x = 0.2, 0.4, 0.6, 0.8 mol%) have been synthesized by the sol-gel method. The composition and microstructure govern the magnetic properties of ferrites. The XRD analysis shows the formation of pure magneto plumbite phase without any other impurity phases. The Zn-Nb substitutions in barium hexaferrite have been confirmed through magnetic measurements. The results show that the magnetic properties are closely related to the distributions of Zn-Nb ions on the five crystallographic sites. The saturation magnetization and coercivity increase with increasing Zn-Nb concentration.

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“…Table III also that the reduction of magnetic coercivity in SrFe 11 (ZnSn) 0.5 O 19 as experimentally observed [16] is mainly due to the occupation of (Zn,Sn) pair at the (4f 1 , 4f 2 ) sites. Although the [2b, 4f 2 ] configuration, the one with second lowest substitution energy at 0 K, has much lower K 1 and H a values, its multiplicity is much lower compared to other low-energy configurations and its formation probability grows merely to 2% (compared to 82% for the [4f 1 , 4f 2 ] configuration) even at 1000 K. This is a different behavior from the related systems BaFe 12−x (Zr 0.5 Zn 0.5 ) x O 19 and LaZnFe 11 O 19 , where the 2b site plays the main role in the reduction of anisotropy [44,45]. Table IV shows the weighted average of physical properties of pure and substituted (Zn, Sn, Zn-Sn) strontium hexaferrite based on the formation probabilities [16].…”

Section: Resultsmentioning

confidence: 85%

Site preference and magnetic properties of Zn-Sn-substituted strontium hexaferrite

Dixit

Thapa

Lamichhane

et al. 2019

Journal of Applied Physics

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The site preference and magnetic properties of Zn, Sn and Zn-Sn substituted M-type strontium hexaferrite (SrFe12O19) have been investigated using first-principles total energy calculations based on density functional theory. The site occupancy of substituted atoms were estimated by calculating the substitution energies of different configurations. The distribution of different configurations during the annealing process at high temperature was determined using the formation probabilities of configurations to calculate magnetic properties of substituted strontium hexaferrite. We found that the magnetization and magnetocrystalline anisotropy are closely related to the distributions of Zn-Sn ions on the five Fe sites. Our calculation show that in SrFe11.5Zn0.5O19, Zn atoms prefer to occupy 4f1, 12k, and 2a sites with occupation probability of 78%, 19% and 3%, respectively, while in SrFe11.5SnO19, Sn atoms occupy the 12k and 4f2 sites with occupation probability of 54% and 46%, respectively. We also found that in SrFe11Zn0.5Sn0.5O19, (Zn,Sn) atom pairs prefer to occupy the (4f1, 4f2), (4f1, 12k) and (12k, 12k) sites with occupation probability of 82%, 8% and 6%, respectively. Our calculation shows that the increase of magnetization and the reduction of magnetic anisotropy in Zn-Sn substituted M-type strontium hexaferrite as observed experimentally is due to the occupation of (Zn,Sn) pairs at the (4f1, 4f2) sites. arXiv:1811.04101v2 [cond-mat.mtrl-sci]

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

Cited by 122 publications

References 34 publications

Chemically prepared magnetic nanoparticles

Chemically prepared magnetic nanoparticles

Microwave Sintering of Zn-Nb Doped Barium Hexaferrite Synthesized via Sol-Gel Method

Site preference and magnetic properties of Zn-Sn-substituted strontium hexaferrite

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