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SUMMARY:Measuring the magnetic properties of materials using defects in di
 amond - Prof. Jean-François Roch
DTSTART:20170801T130000Z
DTEND:20170801T140000Z
UID:TALK75591@talks.cam.ac.uk
CONTACT:Dr Agnieszka Iwasiewicz-Wabnig
DESCRIPTION:The ability to quantitatively map magnetic field distributions
  is of crucial importance for fundamental studies ranging from materials s
 cience to biology\, and for the development of new devices e.g. in spintro
 nics. Recently it has been demonstrated that scanning magnetometry based o
 n a single spin associated to an impurity hosted in a solid is an efficien
 t technique which combines high sensitivity and nanoscale resolution. The 
 sensing signal relies on the optical detection of the electron spin resona
 nce associated with a single nitrogen-vacancy (NV) center in diamond attac
 hed to a AFM tip. The magnitude of the stray magnetic field produced by a 
 magnetic sample can then be determined from the Zeeman shifts of the energ
 y levels associated to this artificial atom in the solid state. I will pre
 sent our development of a scanning magnetometer based on NV centers in a n
 anodiamond grafted at the apex of a AFM tip.\n\nBy adapting this technique
  to the specific environment of a diamond anvil cell (DAC)\, it will be po
 ssible to explore novel type of order in condensed matter that appear at u
 ltra-high pressure\, with associated new forms of fundamental properties s
 uch as magnetism and superconductivity. I will describe our preliminary re
 sults for magnetic sensing above 10 GPa pressure.\n\nThese developments ar
 e integrated in a joint team with the Research Center of Thales R&T (Palai
 seau\, France).  I will describe the goals of this academic-industry partn
 ership. 
LOCATION:Rayleigh Seminar Room\, Maxwell Centre\, Cavendish Laboratory
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