Optimization of nano-magneto-optic sensitivity using dual dielectric layer enhancement

Wang, S. ; Barman, A. ; Schmidt, H. ; Maas, J. D. ; Hawkins, A. R. ; Kwon, S. ; Harteneck, B. ; Cabrini, S. ; Bokor, J. (2007) Optimization of nano-magneto-optic sensitivity using dual dielectric layer enhancement Applied Physics Letters, 90 (25). p. 252504. ISSN 0003-6951

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Official URL: http://doi.org/10.1063/1.2750389

Related URL: http://dx.doi.org/10.1063/1.2750389

Abstract

We discuss maximization of the sensitivity of magneto-optical detection of single nanomagnets. We show that a combination of optimized dielectric coating on the magnets with an antireflection coated substrate can increase the areal magneto-optic sensitivity by about three orders of magnitude in the deep nanometer range. A dual layer nanofabrication process is developed to implement this approach, and magnetization switching of single nickel nanomagnets with 50nm diameter is demonstrated. This work was supported by the National Science Foundation (Grant No. ECS-0245425) and the Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy (Contract No. DE-AC02-05CH11231).

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