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US 4,835,438 AGranted
Source of spin polarized electrons using an emissive micropoint cathode
AssigneeCommissariat a l'Energie Atomique
InventorsRobert Baptist, Ariel Brenac, Gerard Chauvet, Robert Meyer, Francis Muller
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Abstract
Spin polarized electron source using an emissive micropoint cathode. At least one portion of each micropoint, including the top of the latter, is ferromagnetic, so that the electrons emitted by the cathode are spin polarized in a given direction, when the portion is subject to a magnetic field parallel to the given direction.
Claims10
A source of spin polarized electrons comprising:
- at least one first electrode having one face provided with a plurality of micropoints of an electron emitting material and having bases located on said face;
- and at least one second electrode electrically insulated from said first electrode, positioned so as to face said face and having holes respectively facing said bases, each micropoint having a top positioned level with the hole corresponding thereto, so that electrons are emitted by said micropoints when the latter are in a vacuum and said second electrode is positively polarized with respect to said first electrode, and at least one portion of each micropoint, including the top thereof, being ferromagnetic, so that the emitted electrons are spin polarized in a given direction, when said at least one portion is subject to a magnetic field parallel to said given direction.
Dependencies are inferred from the claim text.