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

Marian Vopsaroiu1, John Blackburn and Markys G Cain

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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, giant magneto-resistance 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 effect in laminated multiferroic materials. Such a magnetic read head is much simplified in terms of sensor construction (i.e. number of layers involved and horizontal biasing requirements) and has a range of potential advantages including similar sensitivity to that of the TMR heads, reduced power consumption, better thermal performances, excellent high frequency operation and reduced cost of production.


PACS

85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.

75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction

85.75.Ss Magnetic field sensors using spin polarized transport

75.50.Ss Magnetic recording materials

Subjects

Electronics and devices

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 17 (7 September 2007)

Received 30 March 2007, in final form 28 June 2007

Published 16 August 2007



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