Parabolic Diamond Scanning Probes for Single-Spin Magnetic Field Imaging

Hedrich, Natascha; Rohner, Dominik; Batzer, Marietta; Maletinsky, Patrick; Shields, Brendan

doi:10.1103/physrevapplied.14.064007

Cited by 35 publications

(41 citation statements)

References 43 publications

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“…Specifically, we use state-dependent fluorescence to identify the Zeeman splitting between the |±1 spin levels using optically detected magnetic resonance (ODMR). All measurements in this study were performed using scanning, all-diamond parabolic pillars [41] housing a single NV center and integrated into a custom confocal imaging setup equipped with a CW 532 nm laser [42]. The measurements were performed with <10 µW of continuous-wave optical excitation, a factor of two smaller than typical saturation powers for NVs in these parabolic scanning pillars [41].…”

Section: Nv Magnetometrymentioning

confidence: 99%

“…All measurements in this study were performed using scanning, all-diamond parabolic pillars [41] housing a single NV center and integrated into a custom confocal imaging setup equipped with a CW 532 nm laser [42]. The measurements were performed with <10 µW of continuous-wave optical excitation, a factor of two smaller than typical saturation powers for NVs in these parabolic scanning pillars [41]. The microwave (MW) needed to manipulate the NV is provided by a 30 µm gold loop antenna with a typical effective driving strength of 0.25 G at the NV.…”

Section: Nv Magnetometrymentioning

confidence: 99%

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Nanoscale mechanics of antiferromagnetic domain walls

et al. 2021

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Antiferromagnets offer remarkable promise for future spintronics devices, where antiferromagnetic order is exploited to encode information [1][2][3]. The control and understanding of antiferromagnetic domain walls (DWs) -the interfaces between domains with differing order parameter orientations -is a key ingredient for advancing such antiferromagnetic spintronics technologies. However, studies of the intrinsic mechanics of individual antiferromagnetic DWs remain elusive since they require sufficiently pure materials and suitable experimental approaches to address DWs on the nanoscale. Here we nucleate isolated, 180 • DWs in a single-crystal of Cr2O3, a prototypical collinear magnetoelectric antiferromagnet, and study their interaction with topographic features fabricated on the sample. We demonstrate DW manipulation through the resulting, engineered energy landscape and show that the observed interaction is governed by the DW's elastic properties. Our results advance the understanding of DW mechanics in antiferromagnets and suggest a novel, topographically defined memory architecture based on antiferromagnetic DWs.

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Section: Nv Magnetometrymentioning

confidence: 99%

Section: Nv Magnetometrymentioning

confidence: 99%

Nanoscale mechanics of antiferromagnetic domain walls

et al. 2021

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“…The NV spectrum is obtained with a spectrograph (Princeton Instruments, 12. Optical emission spectrum of a single NV in a diamond nanostructure [22,24]. The highlighted regions indicate the regions of collected PL to separate the slightly overlapping spectra of the charge states NV 0 (orange) and NV − (red).…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…These two types of NV defects were chosen for studying a broad range of local strain, which is known to be increased for NVs implanted close to the diamond surface [21]. To enhance NV PL collection efficiencies, diamond solid immersion lenses and nanopillars were structured on samples S1 and S2, respectively, with methods reported elsewhere [22][23][24].…”

mentioning

confidence: 99%

Low temperature photo-physics of single NV centers in diamond

Happacher,

Broadway,

Reiser

et al. 2021

Preprint

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We investigate the magnetic field dependent photo-physics of individual Nitrogen-Vacancy (NV) color centers in diamond under cryogenic conditions. At distinct magnetic fields, we observe significant reductions in the NV photoluminescence rate, which indicate a marked decrease in the optical readout efficiency of the NV's ground state spin. We assign these dips to excited state level anti-crossings, which occur at magnetic fields that strongly depend on the effective, local strain environment of the NV center. Our results offer new insights into the structure of the NVs' excited states and a new tool for their effective characterization. Using this tool, we observe strong indications for strain-dependent variations of the NV's orbital g-factor, obtain new insights into NV charge state dynamics, and draw important conclusions regarding the applicability of NV centers for low-temperature quantum sensing.

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“…Although this scheme works well for slow acquisition speeds, the non-linear least squares fitting of the spectrum is computationally expensive and ill-suited for real-time performance past a few Hz. On the other hand, the high PL of modern NV tips [28,29] should allow measurements of magnetic fields at rates of 100 Hz or faster while maintaining a high sensitivity below 10 µT. The possibility of acquiring a scan in a matter of minutes rather than hours or days is enticing, and would further bolster the versatility of the * degenc@ethz.ch; † These authors contributed equally.…”

Section: Introductionmentioning

confidence: 99%

Fast scanning nitrogen-vacancy magnetometry by spectrum demodulation

Welter¹,

Josteinsson²,

S.³

et al. 2022

Preprint

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We demonstrate a spectrum demodulation technique for greatly speeding up the data acquisition rate in scanning nitrogen-vacancy center magnetometry. Our method relies on a periodic excitation of the electron spin resonance by fast, wide-band frequency sweeps combined with a phase-locked detection of the photo-luminescence signal. The method can be extended by a frequency feedback to realize real-time tracking of the spin resonance. Fast scanning magnetometry is especially useful for samples where the signal dynamic range is large, of order millitesla, like for ferro-or ferrimagnets. We demonstrate our method by mapping stray fields above the model antiferromagnet α-Fe2O3 (hematite) at pixel rates of up to 100 Hz and an image resolution exceeding one megapixel.

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Parabolic Diamond Scanning Probes for Single-Spin Magnetic Field Imaging

Cited by 35 publications

References 43 publications

Nanoscale mechanics of antiferromagnetic domain walls

Nanoscale mechanics of antiferromagnetic domain walls

Low temperature photo-physics of single NV centers in diamond

Fast scanning nitrogen-vacancy magnetometry by spectrum demodulation

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