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US 2019/0317173 A1Published application
Methods and apparatus for magnetic particle analysis using diamond magnetic imaging
AssigneeQuantum Diamond Technologies Inc.
InventorsColin B. Connolly, Jeffrey D. Randall, Seabron C. Adamson
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Abstract
The present application discloses methods and apparatus for measuring the arbitrary magnetic response of many individual magnetic particles at once, using a plurality of magnetic images of the magnetic particles acquired over a range of magnetic conditions.
Claims28
A method of determining properties of magnetic particles using wide-field diamond magnetic imaging, comprising the steps of:
- (a) generating a set of magnetic images of a plurality of magnetic particles positioned on a sensing surface of a diamond sensor under different magnetic conditions created by varying the magnitude and/or direction of an externally-applied magnetic field applied to the magnetic particles;
- and
- (b) analyzing the set of magnetic images to measure single-particle magnetization along single-axis magnetization curves to infer magnetic properties of individual magnetic particles in the plurality of magnetic particles.
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A system for determining properties of magnetic particles, comprising:
- a wide-field diamond magnetic imaging apparatus for generating a set of magnetic images of a plurality of magnetic particles under different magnetic conditions, the apparatus including:
- a) a diamond imaging sensor with a sensing surface containing a layer of diamond nitrogen-vacancy (NV) centers on which the magnetic particles are positioned;
- b) a source of excitation light for inducing NV center fluorescence at the sensor surface;
- c) at least one magnet for applying a bias magnetic field on the magnetic particles;
- d) a microwave source for applying a microwave field to the sensing surface;
- and
- e) an optical imaging system having an imaging sensor to image the NV center fluorescence from the sensor surface, the optical imaging system including an objective lens and a second lens focusing image light onto the imaging sensor;
- and
- a computer system operatively coupled to the wide-field diamond magnetic imaging apparatus for analyzing the set of magnetic images to infer magnetic properties of individual magnetic particles in the plurality of magnetic particles.
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Dependencies are inferred from the claim text.