Diamond magnetometer enhanced by ferrite flux concentrators
| Autor: | Ilja Fescenko, Nathaniel Ristoff, Janis Smits, Igor Savukov, Andrey Jarmola, Nazanin Mosavian, Victor M. Acosta, Pauli Kehayias, Joshua Damron |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Physics - Instrumentation and Detectors Magnetometer FOS: Physical sciences 02 engineering and technology Applied Physics (physics.app-ph) engineering.material 01 natural sciences Article law.invention law 0103 physical sciences Thermal Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Laser power scaling 010306 general physics Condensed Matter - Mesoscale and Nanoscale Physics business.industry Microwave power Diamond Instrumentation and Detectors (physics.ins-det) Physics - Applied Physics 021001 nanoscience & nanotechnology Magnetic flux Magnetic field engineering Ferrite (magnet) Optoelectronics 0210 nano-technology business Optics (physics.optics) Physics - Optics |
| Zdroj: | Physical review research |
| Popis: | Magnetometers based on nitrogen-vacancy (NV) centers in diamond are promising room-temperature, solid-state sensors. However, their reported sensitivity to magnetic fields at low frequencies (10 pT s^{1/2}, precluding potential applications in medical imaging, geoscience, and navigation. Here we show that high-permeability magnetic flux concentrators, which collect magnetic flux from a larger area and concentrate it into the diamond sensor, can be used to improve the sensitivity of diamond magnetometers. By inserting an NV-doped diamond membrane between two ferrite cones in a bowtie configuration, we realize a ~250-fold increase of the magnetic field amplitude within the diamond. We demonstrate a sensitivity of ~0.9 pT s^{1/2} to magnetic fields in the frequency range between 10 and 1000 Hz, using a dual-resonance modulation technique to suppress the effect of thermal shifts of the NV spin levels. This is accomplished using 200 mW of laser power and 20 mW of microwave power. This work introduces a new dimension for diamond quantum sensors by using micro-structured magnetic materials to manipulate magnetic fields. Main text: 6 pages, 5 figures. Entire manuscript including Appendices: 18 pages, 16 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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