Magnetic Micro and Nano Wires

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Our research activities focus on the behaviour of metallic magnetic microwires and nanowires. The work on microwires focuses on giant magnetoimpedance, the extremely high (100s of %) changes in electrical impedance produced by small changes in magnetic fields. The response when the current is small is now reasonably well understood. We are working primarily on non-linear effects, and on the magnetic noise, which is the ultimate limitation on the application of these effects in sensors. The study of nanowire arrays is a relatively new field, and we have developed a simple picture of the interaction fields produced by the wires and acting on the others. Much remains to be understood concerning their domain structure and magnetic reversal processes. Their high frequency behaviour is of considerable interest. We are also working on the subject of multiexcitation entropy. This effect is important in kinetic processes, observed in chemistry, solid state physics, geology, and biology.