Development of advanced barium ferrite tape media

Sakai, Osamu; Oyanagi, Masahito; Morooka, Atsushi; Mori, Masahiko; Kurihashi, Yuich; Tada, Takeshi; Suzuki, Hiroyuki; Harasawa, Takeshi

doi:10.1016/j.jmmm.2015.07.015

Cited by 23 publications

(19 citation statements)

References 17 publications

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“…M‐type hexaferrites (MeFe 12 O 19 , Me = Ba, Sr, Pb) have a magnetoplumbite structure, among them BaFe 12 O 19 and SrFe 12 O 19 have been widely used as permanent magnets because their suitable saturation magnetization and coercive field, joined to a low cost and high chemical stability. In addition to their continuous significance in magnetic recording media , materials based in these compounds present currently a renewed interest for applications in microwave devices and an increased importance in relation to magnetoelectric effect and even multiferroic properties .…”

Section: Introductionmentioning

confidence: 99%

Coercivity global model and magnetization reversal in fine hexaferrites

Faloh-Gandarilla

Díaz-Castañón

2017

Physica Status Solidi (b)

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In this work, the so‐called global model for magnetization reversal is applied to describe the coercive field temperature dependence in fine barium and strontium M‐hexaferrites (75–300 K range). Using magnetic viscosity measurements, the temperature dependence of the activation volume for magnetization reversal was obtained. In this temperature range, the coercive field (as the anisotropy field) increases with increasing temperature. However, it is found experimentally that the activation volume also increases with temperature and then the physical interpretation of the model is partially not clear.

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Section: Introductionmentioning

confidence: 99%

Coercivity global model and magnetization reversal in fine hexaferrites

Faloh-Gandarilla

Díaz-Castañón

2017

Physica Status Solidi (b)

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“…With regard to magnetic recording, we note that industrial heads have a high saturation induction of 1.8–2.2 T due to the use of FeCo alloy [ 2 , 67 , 68 , 69 ], whereas our alloy free of expensive cobalt has the comparable induction in weaker magnetic fields. This realizes efficient operation with a lower amperage, a smaller cross-section of electrical conductor, and a smaller number of magnetizing winding turns, which allow one to reduce the size and weight of devices while maintaining their operational characteristics.…”

Section: Discussionmentioning

confidence: 99%

FeZrN Films: Magnetic and Mechanical Properties Relative to the Phase-Structural State

et al. 2021

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The paper presents results of investigation of Fe65.3–100Zr34.7–0N7.5–0 films prepared by dc magnetron deposition on glass substrates and subsequent 1-hour annealing at temperatures of 300–600 °C. The influence of the chemical and phase compositions and structure of the films, which were studied by TEM, SEM, XRD, and GDOES, on their mechanical properties determined by nanoindentation and static magnetic properties measured by VSM method is analyzed. The studied films exhibit the hardness within a range of 14–21 GPa, low elastic modulus (the value can reach 156 Gpa), and an elastic recovery of 55–83%. It was shown that the films are strong ferromagnets with the high saturation induction Bs (up to 2.1 T) and low coercive field Hc (as low as 40 A/m). The correlations between the magnetic and mechanical properties, on one hand, and the chemical composition of the films, their phase, and structural states as well, on the other hand, are discussed.

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“…Thus, the hexaferrite nanoparticles are a reasonable material when nanomagnets are required for diverse purposes. For example, hexaferrites are attractive for high-density magnetic recording tape media [ 1 , 4 , 5 ] and low-frequency magnetic hyperthermia [ 6 ], as well as for magnetic colloids of hard magnetic particles, which are hugely different from traditional magnetite-based ferrofluids and demonstrate several unique properties [ 7 , 8 , 9 ]. Certainly, the colloidal hexafeFrrite nanoparticles are building blocks for the creation of magnetic nanostructures [ 10 , 11 ], nanocomposites [ 12 , 13 ], and various nanomaterials [ 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Glass-Ceramic Synthesis of Cr-Substituted Strontium Hexaferrite Nanoparticles with Enhanced Coercivity

Trusov

Sleptsova

Duan³

et al. 2021

Nanomaterials

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Magnetically hard ferrites attract considerable interest due to their ability to maintain a high coercivity of nanosized particles and therefore show promising applications as nanomagnets ranging from magnetic recording to biomedicine. Herein, we report an approach to prepare nonsintered single-domain nanoparticles of chromium-substituted hexaferrite via crystallization of glass in the system SrO–Fe2O3–Cr2O3–B2O3. We have observed a formation of plate-like hexaferrite nanoparticles with diameters changing from 20 to 190 nm depending on the annealing temperature. We demonstrated that chromium substitution led to a significant improvement of the coercivity, which varied from 334 to 732 kA m−1 for the smallest and the largest particles, respectively. The results provide a new strategy for producing high-coercivity ferrite nanomagnets.

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Development of advanced barium ferrite tape media

Cited by 23 publications

References 17 publications

Coercivity global model and magnetization reversal in fine hexaferrites

Coercivity global model and magnetization reversal in fine hexaferrites

FeZrN Films: Magnetic and Mechanical Properties Relative to the Phase-Structural State

Glass-Ceramic Synthesis of Cr-Substituted Strontium Hexaferrite Nanoparticles with Enhanced Coercivity

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