Magnetic characterisation of thin film recording media

O’Grady, K.; Chantrell, R.W.; Sanders, I.L.

doi:10.1109/20.195584

Cited by 54 publications

(15 citation statements)

References 19 publications

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“…Similar strong Cr segregation is also recognized in tlle longitudinal CoCr 16 Ta 4 medium, where tlle Cl' enriched non-magnetic layer thickness is determined to be 1-2 nm [20]. Figure 3 shows the schematic model for exchange decoupled low noise perpendicular medium [21].…”

Section: Thermal Stability Considerationmentioning

confidence: 95%

“…The employment of high sensitive reproducing head makes it possible to use a thinner medium than with a conventional inductive-type head. This is advantageous to decrease tlle medium noise which depends on the magnetic switching volume [15,16]. The volume depends on tlle recording layer tllickness and the magnetic exchange coupling between the neighboring magnetic crystalline grains which form the recording layer.…”

Section: Thermal Stability Considerationmentioning

confidence: 99%

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Investigation of High Density Magnetic Recording with Single-layer Perpendicular Media

et al. 1997

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Abstract---This paper describes the recent research results on magnetic recording with single-layer perpendicular recording media. This includes the thermal stability of recorded information, the linear recording density resolution, the recorded track edge profile, the media noise, the nonlinear transition shifts, the signal decay due to demagnetizing field, etc. The combination of Co-alloy single-layer perpendicular media with high perpendicular magnetic anisotropies (Mr/Ms>O.95) and ring-head writing has a high potential to increase the attainable areal density beyond 10 Gb/in 2 while avoiding or reducing the difficulties which are feared to face with the conventional longitudinal magnetic recording.

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Section: Thermal Stability Considerationmentioning

confidence: 95%

Section: Thermal Stability Considerationmentioning

confidence: 99%

Investigation of High Density Magnetic Recording with Single-layer Perpendicular Media

et al. 1997

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“…The key issue regarding the medium used with an MR or GMR head is not the output signal amplitude, but the signal-tonoise ratio (S/N). To achieve a high S/N in longitudinal recording, it is necessary to reduce the magnetic interaction, AM, in the medium [2], [ 3 ] . As regards perpendicular media, several calculations [4], [5] and measurements [6], [7] of the Henkel plot [SI have been reported, but the correlation between the perpendicular magnetic interaction, AMI, and S/N has not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Noise and ΔM⊥ analysis of a Cr-rich Co-Cr perpendicular medium for an MR head

et al. 1996

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The medium noise in a Cr-rich Co-Cr alloy perpendicular medium was investigated by using an MR head designed for longitudinal recording. Medium with a Cr content of 28 at.% showed a high crystalline orientation and a low write-demagnetization effect. The signal-to-noise ratio ( S N ) of the medium was higher than that of conventional Co-Cr perpendicular media for inductive heads. The advantages of the medium derive from the large inter-particle perpendicular magnetic intexaction (AML) of media, which increased linearly with the Cr content, reaching a maximum value at 28 at.%. This strong interaction in the medium results in a high SIN for a recording system using a single-layer perpendicular medium and an MR head.

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“…Palladium (Pd) is commonly used for the calibration owing to its large and linear magnetic susceptibility [136]. In this study, VSM (ADE, model 10) has been used.…”

Section: Vibrating Sample Magnetometermentioning

confidence: 99%

New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

et al. 2014

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Spintronics is a new and emerging field in nanotechnology, which has been evolving rapidly. It aims to exploit the spin degree of freedom in order to realise advanced electronic devices. With the recent improvement in the storage media devices following to the discovery of giant magnetoresistance effect, it is envisioned that the electronic devices have several advantages over the conventional electronics in respect to the storage capacity, speed and power consumption. One avenue towards next generation spintronic devices is to develop half-metallic ferromagnets (HMFs) with 100% spin polarisation (P) and Curie temperature (T C ) above room temperature (RT). HMFs have unique properties, in which the majority spins have a metallic band structure, whereas the minority spins have a semiconducting band with the Fermi level (E F ) lying within an energy gap. P of HMFs has been predominantly estimated using Julliere's formula in a magnetic tunnel junction (MTJ) or measured by the Andreev reflection (AR) at low temperature. Both methods are very sensitive to the surface/interface spin polarisation.Alternative optical methods such as photoemission have also been employed. However, these methods require a complicated and expensive set-up. Therefore, it is of paramount importance to directly and easily measure the band-gap of HMFs.The main aim of this study is to develop a new technique to directly measure the band-gap (E g ) of HMFs at RT. For that, a simple experimental set-up has been designed This technique allows measuring E g of HMFs at RT for the first time. It can therefore be used to provide simple optimisation of growth conditions.iii

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Magnetic characterisation of thin film recording media

Cited by 54 publications

References 19 publications

Investigation of High Density Magnetic Recording with Single-layer Perpendicular Media

Investigation of High Density Magnetic Recording with Single-layer Perpendicular Media

Noise and ΔM⊥ analysis of a Cr-rich Co-Cr perpendicular medium for an MR head

New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

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