Reduction in remanent magnetization using a multi-layered single-pole writer

Mochizuki, Masafumi; Ishikawa, Chiaki; Okada, Y.; Nakamoto, K.

doi:10.1016/j.jmmm.2004.10.061

Cited by 4 publications

(1 citation statement)

References 7 publications

(9 reference statements)

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“…It is stated that design considerations in the perpendicular head are biased toward a general configuration in which, "a highly remanent state in the pole tip is energetically favorable" (4). In actuality, pole erasure is a function of the interrelationship between head stack, yoke, and media design in addition to the magnetic and material properties of the write pole material itself (4,6,7,8,9). Even excluding the design issues, given the complexity of simulating the magnetic state of the head as a function of all of these diverse design parameters, various material and/or magnetic properties of the head core material have been identified as being important, including internal stress, anisotropy field (6,10), and magnetostriction (5,7).…”

Section: Introductionmentioning

confidence: 99%

Physical Properties of High Iron Nickel-Iron Films Deposited by Direct Current Plating

Sasaki

Medina

2007

ECS Trans.

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High iron (> 80%) nickel-iron (NiFe) films were electroplated via direct current from a sulfate/chloride bath. When used as the head core material in perpendicular magnetic recording (PMR) write heads, these magnetically soft, high stress, and low magnetostriction (in comparison to NiCoFe and CoFe films) NiFe electroplates were found to be an acceptable potential candidate for the first generation of PMR recording heads.

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Section: Introductionmentioning

confidence: 99%

Physical Properties of High Iron Nickel-Iron Films Deposited by Direct Current Plating

Sasaki

Medina

2007

ECS Trans.

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Dynamics of laminated write elements

Heinonen

Nazarov

Plumer

2006

Journal of Applied Physics

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One concern as storage technology moves to perpendicular recording is the remnant state of the writer top pole. In principal, a remnant state with a substantial magnetization density perpendicular to the recording medium can lead to the unwanted erasure of data. Also, it is desirable to have the writer reach a nonerasing remnant state as quickly as possible. One technique to reduce the magnetization in the remnant state is to laminate the pole tip with some nonmagnetic material [Y. Satoh, A. Ohtsubo, and Y. Shimada, IEEE Trans. Magn. 21, 1551 (1985); S. Wang et al., IEEE Trans. Magn. 30, 3897 (1994)]. We have performed fully micromagnetic simulations of write elements with eight, five, four, and two laminates coupled antiferromagnetically. Results are presented for recording fields, as well as for the decay of the magnetization to a remnant state. The two- and four-laminate write elements typically have a vortex induced in the pole tip, and this vortex tends to survive, even in the remnant state. This can give rise both to a slow decay as well as large remnant fields from the out-of-plane magnetization in the vortex. On the other hand, the magnetization of the eight-laminate pole tip decays by “scissoring” of the magnetization in the laminates, with a faster decay to the remnant state. However, locally large divergences of the magnetization density can give rise to “hot spots” with relatively large remnant fields.

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