Localized magnetic fields in arbitrary directions using patterned nanomagnets.
Control of the local magnetic fields desirable for spintronics and quantum information technology is not well developed. Existing methods produce either moderately small local fields or one field orientation. We present designs of patterned magnetic elements that produce remanent fields of 50 mT (potentially 200 mT) confined to chosen, submicrometer regions in directions perpendicular to an external initializing field. A wide variety of magnetic-field profiles on nanometer scales can be produced with the option of applying electric fields, for example, to move a quantum dot between regions where the magnetic-field direction or strength is different. We have confirmed our modeling by measuring the fields in one design using electron holography.
McNeil
Robert P G
RP
Cavendish Laboratory, University of Cambridge, Cambridge, U.K. rpgm2@cam.ac.uk
Schneble
R Jeff
RJ
Kataoka
Masaya
M
Ford
Christopher J B
CJ
Kasama
Takeshi
T
Dunin-Borkowski
Rafal E
RE
Feinberg
Joshua M
JM
Harrison
Richard J
RJ
Barnes
Crispin H W
CH
Tse
Desmond H Y
DH
Trypiniotis
Theodossis
T
Bland
J Anthony C
JA
Anderson
David
D
Jones
Geb A C
GA
Pepper
Michael
M
D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008280:Magnetics / Q000295:instrumentation*; D036103:Nanotechnology / Q000295:instrumentation*