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November 25, 2008

Mtg: Patterned Nanoscale Magnetic Field Sources

by @ 4:58 pm. Filed under ALL, BioEngineering, Electronics Design, Engineering Mgmt, NanoEngineering, Semiconductors
 

FRIDAY December 12, 2008
OEB Magnetics
Subject:?
Speaker: Dan A. Allwood, Univ. of Sheffield (UK)
Time: 3;00 PM
Cost: none
Place: Lawrence Berkeley Nat’l Lab, bldg 6-2202, UC-Berkeley
RSVP: by email with name, company, to Peter Fischer, PJFischer@lbl.gov by Dec 10
Web: ewh.ieee.org/r6/oeb/mag

Patterned magnetic thin film technology has developed rapidly over recent years, with potential applications in sensor, memory and logic technology envisaged. ? In particular, extended nanowires made of simple alloys such as Ni-Fe are used in order to support magnetic domain walls. ? Usually, devices are operated by propagating domain walls using an applied magnetic field or electrical current through the nanowire. ? However, magnetic domain walls in patterned wires are also nanoscale sources of magnetic field. ? This field is very high at the nanowire surface (~ 1 T) but drops off rapidly over a few micrometers. ? We are currently investigating ways of using this stray field to trap biological cells and laser cooled atoms. ? In one example, we are labeling Schwann cells found in peripheral nerve tissue with superparamagnetic beads and attempting to create a magnetic template for positioning the cells relative to each other. ? The proximity of the cells is understood to be important for triggering cell division and the development of nerve tissue. ? If successful, this offers a novel route to nerve tissue engineering for surgical use. ? For atom trapping, we require an ensemble of laser-cooled atoms such as 87Rb to be addressed into a low-field-seeking state. ? We can then bias the stray field from domain walls to create a zero-dimensional atom trap with very strong confinement characteristics. ? The promise of this system is to allow a series of mobile atom traps to enable qubit interactions in a scalable magnetic architecture.

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