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A new magnetic recording read head technology based on the magneto-electric effect

Vopsaroiu, M; Cain, M G; Blackburn, J (2007) A new magnetic recording read head technology based on the magneto-electric effect. J. Phys. D, Appl. Phys., 40. pp. 5027-5033.

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The existing magnetic recording read head technologies use one of the well-known magneto-resistance effects (i.e. anisotropic magneto-resistance (AMR), giant magneto-resistance (GMR) or tunnelling magneto-resistance (TMR)) to read back the data from the magnetic recording medium. These are usually sophisticated devices that require a DC test current flowing through the sensor stack in order to measure its change in resistance (i.e. amplitude response signal) as a function of the fringing magnetic flux of the recorded bits, when the reader moves along the recorded track. In this paper, we propose the design of a new kind of highly sensitive read sensor for magnetic recording heads, which directly produces a voltage response without the need for a test current. This new design is based on the magneto-electric (ME) effect in laminated multiferroic materials. Such a magnetic read head is much simplified in terms of sensor construction such as number of layers involved, and horizontal biasing requirements and has a range of potential advantages including better or similar sensitivity to that of the TMR heads, reduced power consumption, better thermal performances and reduced cost of production. We also give a brief introduction to the multiferroic materials and the theoretical estimations of the ME effect for a tri-layer laminated multiferroic structure and its output voltage when implemented as a magnetic reader.

Item Type: Article
Keywords: Magnetic recording read heads, magneto-electric effect, multiferroic materials
Subjects: Electromagnetics
Electromagnetics > Electromagnetic Materials
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/3966

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