Thin-film inductive heads

Chiu, Allan; Heim, David; Jones, Reese E.; Kasiraj, P.; Klaassen, K.B.; Mee, C. Denis; Simmons, R.G.

doi:10.1147/rd.403.0283

Cited by 35 publications

(12 citation statements)

References 43 publications

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“…Generally, disk media are magnetically hard alloys of Co, and readwrite sensors are predominantly soft alloys of Ni and Fe, such as Permalloy (Ni,,Fe,,). Before the introduction of charge memory devices, such as dynamic RAM, magnetic thin films were considered as an alternative to magnetic core memories (2). because for a given electron spin state in one layer, there are a small number of empty electron states with the same spin in the other layer.…”

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confidence: 99%

The Magnetic Stability of Spin-Dependent Tunneling Devices

Gider

Runge

Marley

et al. 1998

Science

137

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The tunneling resistance between two ferromagnetic metal layers that are separated by a thin insulator depends on the relative orientation of the magnetization M of each layer. In a memory device, independent switching of the magnetically soft layer is achieved by making the other layer either exchange-biased or magnetically hard. The repeated reversal of M of the soft layer by field cycling can demagnetize the other magnetically hard layer and thus erase the tunnel junction's memory. The M of exchange-biased structures was stable at least to 10(7) cycles, whereas in hard structures, M generally decayed logarithmically with the number of field cycles. The decay was very sensitive to the thickness of the hard layer and the composition of the soft layer. However, no decay was observed when the moment reversal was accomplished by coherent rotation, establishing that demagnetization results from the formation and motion of domain walls in the soft layer during field cycling.

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confidence: 99%

The Magnetic Stability of Spin-Dependent Tunneling Devices

Gider

Runge

Marley

et al. 1998

Science

137

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“…Significant progress has been made on thin-film inductive write heads, following the technology evolution of the last 30-40 years [15], yet the requirements and challenges remain similar.…”

Section: Discussionmentioning

confidence: 99%

Advanced write heads for high density and high data rate recording

et al. 2002

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Advanced write head designs improve write efficiency, by reducing yoke length to less than 15 m, adapting a sunken coil/P1 pedestal structure with stitched pole, and utilizing high moment poles with greater than 2 Tesla moment. Sufficient bit-error rate was achieved up to 680 kBPI, using heads with 50-60 GB/in 2 dimensions. For wider track width heads, spin-stand testing showed good writing parametrics and soft error rate up to 1.0-1.1 Gb/s channel data rate, with product electronics and channels. Feasibility of high-speed recording up to 1.5 Gb/s is demonstrated using experimental write drivers.Index Terms-High data rate, high moment, write head.

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“…[2,15] Electrodeposited magnetic thin films of the iron group metals (Fe, Co, and Ni) are being studied because of potential applications in computer read/write heads. [16,17] Among the works on electrodeposited Fe, one may cite the one where Fe is electrodeposited on Au(111), [18] the authors showed that the magnetization switches from out-of-plane to in-plane orientation above a critical thickness. Daheum Kim et al [19] studied electrodeposited Fe from chloride and sulfate baths and observed that Fe films grown from sulfate bath have more compact and dense crystallites compared to those from chloride bath.…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Fe Films Electrodeposited on Al Substrates

Mebarki

Layadi

Khelladi

et al. 2016

Metall Mater Trans A

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Series of Fe films have been prepared by electrodeposition in a solution of iron chloride onto Al substrate. Different deposition times were used in the elaboration process. The texture, the strain, and the grain size values were derived from X-ray diffraction experiments. Scanning electron microscopy (SEM) has been used to get the surface and the cross section images. Vibrating Sample magnetometer has been used to obtain the hysteresis curves; the external magnetic field was applied in different directions in the film plane, and also perpendicular to the film. Hysteresis curves have been obtained at low temperatures [120 K (À153°C) to room temperature]. The h100i texture, small strain, and grain size ranging from 58 to 113 nm are found for these Fe/Al films. All samples show an in-plane magnetic anisotropy, with no preferred orientation within the film plane. Depending on the film thickness range, different mechanisms have been found to be responsible for the coercive field H C behavior. These magnetic properties are correlated with the structural ones and with the SEM observations.

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Thin-film inductive heads

Cited by 35 publications

References 43 publications

The Magnetic Stability of Spin-Dependent Tunneling Devices

The Magnetic Stability of Spin-Dependent Tunneling Devices

Advanced write heads for high density and high data rate recording

Structural and Magnetic Properties of Fe Films Electrodeposited on Al Substrates

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