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Proceedings Paper

Development of NiFe micromagnet stripes for solid-state NMR quantum computing
Author(s): Atsushi Takahashi; Dong F. Wang; Yoshinori Matsumoto; Kohei M. Itoh
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Paper Abstract

An all-silicon quantum computer architecture using 29Si nuclear spins qubits buried in the spin-free matrix of 28Si has been suggested. It requires an array of micro-magnets which impose a large magnetic field gradient along the chain of the 29Si nuclear spins qubits, which allow for the NMR frequency difference between two neighboring 29Si qubits. In this work, we report on the successful fabrication of an array of NiFe (Ni45%-Fe55%) micro-magnet stripes (the cross-section 1.2x1 μm2) formed directly on natural Si wafers using reactive ion etching (RIE) with the NH3-CO-Xe gas mixture. The magnetic field gradient calculation with the finite element method with the geometry of the fabricated NiFe stripes predicts the gradient of 0.4T/μm at the distance 100nm away from the micro-magnet when the stripes are placed in the static magnetic field of 6T for the NMR measurement. The magnetic property of fabricated NiFe stripes was also measured with SQUID, and confirmed that saturation magnetization hadn’t been deteriorated through RIE process.

Paper Details

Date Published: 23 February 2005
PDF: 8 pages
Proc. SPIE 5650, Micro- and Nanotechnology: Materials, Processes, Packaging, and Systems II, (23 February 2005); doi: 10.1117/12.582248
Show Author Affiliations
Atsushi Takahashi, Keio Univ. (Japan)
Dong F. Wang, Ishinomaki Senshu Univ. (Japan)
Yoshinori Matsumoto, Keio Univ. (Japan)
Kohei M. Itoh, Keio Univ. (Japan)

Published in SPIE Proceedings Vol. 5650:
Micro- and Nanotechnology: Materials, Processes, Packaging, and Systems II
Jung-Chih Chiao; David N. Jamieson; Lorenzo Faraone; Andrew S. Dzurak, Editor(s)

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