Properties of barium hexaferrite powders for magnetic recording

Pfeiffer, H. P.; Chantrell, R.W.; Görnert, P.; Schüppel, W.; Sinn, Ekkehard; Rösler, Michael

doi:10.1016/0304-8853(93)90115-i

Cited by 73 publications

(18 citation statements)

References 10 publications

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“…In order to satisfy the utilization requirements of this compound in recording media, permanent magnets, microwave devices and magneto-optics, etc. [6][7][8], many studies have focused on tailoring hexaferrites with modified magnetic properties by substituting Fe 3+ ions with divalent, trivalent and tetravalent cations or cations combinations [9][10][11][12][13][14][15][16][17][18]. For this purpose, several methods have been used to prepare hexaferrite particles including sol-gel method [19,20], mechano-combusition method [21], microwave-induced hydrothermal reaction [22], ammonium nitrate melt technique [23], reverse micelle technique [24], citrate-nitrate gel combustion method [25], co-precipitation method [26] and ball milling method [27,28].…”

Section: Introductionmentioning

confidence: 97%

Structural and magnetic properties of BaFe12−2xTixRuxO19

Bsoul

Mahmood

Lehlooh

2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 97%

Structural and magnetic properties of BaFe12−2xTixRuxO19

Bsoul

Mahmood

Lehlooh

2010

Journal of Alloys and Compounds

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“…These materials have been investigated due to their importance for both fundamental research and technological applications in permanent magnets, high-density magnetic recording, magneto-optics and microwave devices [1][2][3][4][5][6]. Different techniques have been used to prepare and characterize hexaferrite particles [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Mahmood

Bsoul

2012

EPJ Web of Conferences

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Abstract. In this article, the thermomagnetic properties of a system of Ga-substituted barium hexaferrite nanoparticles (BaFe 12-x Ga x O 19 ) prepared by ball milling were investigated. The thermomagnetic curves for the samples with x ranging from 0.0 to 1.0 exhibited sharp peaks with high magnetization just below T C (Hopkinson peaks). The height of the peak for our samples was similar or larger than previously observed or calculated values. Theoretical treatment of the experimental data demonstrated that the peaks are due to the effect of superparamagnetic relaxations of the magnetic particle. This effect was confirmed by hysteresis measurements at, and just below the temperature at which the peak occurred. Consequently, the particle diameters were calculated from the experimental data using a theoretical model based on the superparamagnetic behavior of a system of uniaxial, randomly oriented, single domain, non-interacting particles. The calculated diameters of 11 -26 nm are less than the physical diameters determined from TEM measurements. The factors responsible for the low calculated values are discussed.

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“…Hexagonal barium hexaferrite (BaFe 12 O 19 ), often denoted as M-type BaM, is widely used in electronics, e.g. permanent magnets, particulate media for magnetic recording [1][2][3][4] and microwave devices. These last ones can be found in multilayer chip inductors as the main surface mount devices (SMDs) usually operated in the 0.3-1 GHz frequency range [5].…”

Section: Introductionmentioning

confidence: 99%