Chapter 2 Magnetic recording hard disk thin film media

Lodder, J.C.

doi:10.1016/s1567-2719(98)11006-5

Cited by 5 publications

(3 citation statements)

References 185 publications

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“…The continuous request for high-density non-volatile data storage media has been stimulating major research activities in the area of magnetic thin films for several years (see, e.g. [1]). More recently, the dominant driving force comes from the immense technological potential promised by magnetoelectronics [2], i.e.…”

Section: Introductionmentioning

confidence: 99%

Investigating surface magnetism by means of photoexcitation electron emission microscopy

2002

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The imaging of surfaces by means of photoexcitation electron emission microscopy (PEEM) has recently received considerable interest. This is mainly due to the extended use and availability of brilliant synchrotron radiation in the soft x-ray regime which generally facilitates studies with surface specificity and chemical selectivity. The most popular application of the x-ray PEEM (XPEEM) technique concerns studies of magnetic systems and phenomena. By exploiting the high degree of circular or linear polarization of the synchrotron light, the magnetic microstructure in both ferromagnets and antiferromagnets can be visualized. In this contribution we demonstrate the unique potential and the versatility of the PEEM approach, and review the current status with a certain emphasis on experiments with soft x-ray excitation. In some cases, the high-energy excitation studies can be complemented by laboratory experiments employing threshold photoemission with ultraviolet light (UV-PEEM). Current limitations and future developments and perspectives of the PEEM technique applied to magnetic systems are discussed.

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Section: Introductionmentioning

confidence: 99%

Investigating surface magnetism by means of photoexcitation electron emission microscopy

2002

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“…Among the studied samples the sample with x = 0.0 shows lowest SFD -2.6, and highest Hc -1202.4 Oe would be most suitable for magnetic recording application [40], while sample with x = 0.56 shows lowest Hc -78.7 Oe, highest SFD -24.7, would be more suitable for targeted drug delivery applications [4].…”

Section: Xrdmentioning

confidence: 99%

Structural, Mössbauer and magnetic study of Co1-xZnxFe2O4 (x = 0.0 − 0.56) nano ferrites

Kane¹,

Verma²,

Modak

et al. 2022

Hyperfine Interact

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We report on the synthesis of spinel Co1-xZnxFe2O4 (x=0.00.56) ferrites by sol-gel auto-combustion method. Xray diffraction 'XRD', magnetic measurements were used to study compositionaldependence of structural, magnetic properties, connection among them. Mössbauer spectroscopy was used to identify non-magnetic-phase, its effect on magnetic properties. Single-phased nano spinel-ferrite formation is confirmed by XRD. Increasing Zn-content leads to structural modifications such as decrease of lattice parameter, grain diameter DW-H, alteration of inversion parameter, disorder, tensile-strain, dislocation density, variation of A-O-B, A-O-A, B-O-B superexchange-interaction and canting angles. Cationic distribution suggests that Fe 3+ , Co 2+ ions reside on both A, Bsites, and with increasing Zn-content, B-site population of Fe 3+ , Zn 2+ ions increases; while that of Co 2+ ions decreases. Saturation magnetization shows noticeable dependence on canting angle suggests that the magnetization in the studied samples is described by Yafet-Kittel three-sub-lattice model. Coercivity Hc values are consistent with anisotropy, and its dependence on DW-H suggests that the studied samples are in overlap-region between multiple-domains/single-domain. Reduced-remanence indicate the variation of inter-grain magnetostatic-interaction, isotropic-behavior of multi-domain particles. Observed broad peaks in magnetization derivative with field suggest large-number of dislocations, more-uniform particle-size. Switching-fielddistribution proposes potential application of the studied x=0.0 sample in high density recording, and sample with x=0.56 in targeted drug delivery. Mössbauer measurements confirm three-magnetic-components corresponding to A,B-sites, Fe3+ ions in grain boundaries/surface, Fe has 3+ oxidation state, and growing paramagneticdoublet, alone does not explain the trend of Ms, suggesting that it is a collective-effect of structural-modification, presence of paramagnetic-doublet.

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“…Generally, the SFD is associated with recording factors such as optimal bias current and noise. System with small SFD and high H c are appropriate for high density recording as mentioned before [40].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Ameliorating Physical Properties of Co1-xCaxFe2O4 Nano Ferrites for Technological Applications

Ateia

2020

Magnetic Oxides and Composites II

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In the present chapter, we report physical properties of Co 1-x Ca x Fe 2 O 4 (0.0 ≤ x ≤ 1.0) nano ferrites, prepared by a citrate auto combustion method for technological applications. The evaluation of XRD patterns and HRTEM images indicated fine particle nature. The prepared calcium sample showed orthorhombic phase structure, while the other investigated samples showed cubic spinel structure. The magnetic hysteresis loops at different temperatures (77, 100, and 300 K) were recorded using a vibrating sample magnetometer. The obtained data shows that, the shape of investigated nano ferrite particles can be used as a powerful tool for adapting magnetic properties.

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Chapter 2 Magnetic recording hard disk thin film media

Cited by 5 publications

References 185 publications

Investigating surface magnetism by means of photoexcitation electron emission microscopy

Investigating surface magnetism by means of photoexcitation electron emission microscopy

Structural, Mössbauer and magnetic study of Co1-xZnxFe2O4 (x = 0.0 − 0.56) nano ferrites

Ameliorating Physical Properties of Co1-xCaxFe2O4 Nano Ferrites for Technological Applications

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