Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session V24: Detection and Imaging of Magnetic Dynamics Using Nitrogen-Vacancy Centers in DiamondInvited
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Sponsoring Units: GMAG Chair: Greg Fuchs, Cornell University Room: New Orleans Theater C |
Thursday, March 16, 2017 2:30PM - 3:06PM |
V24.00001: Probing spin waves using single electron spins Invited Speaker: Toeno van der Sar Spin waves are elementary excitations of magnetic materials that may play a key role in future information processing. Spin waves can be probed via the magnetic fields they generate, but this requires a technique with high sensitivity and nanometer sensor-sample distances. We are using the excellent magnetic-field sensitivity of nitrogen-vacancy sensor spins in diamond to explore spin-wave physics in ferromagnets. We have developed techniques to detect localized spin-wave resonances and thermally excited spin waves, and recently achieved a breakthrough by detecting a spin-wave chemical potential. These results open up exciting possibilities for nanoscale imaging and control of spin transport in mesoscopic spin systems. [Preview Abstract] |
Thursday, March 16, 2017 3:06PM - 3:42PM |
V24.00002: Coupling nitrogen-vacancy centers to a dynamic ferromagnetic vortex for fast, nanoscale spin addressability and control Invited Speaker: Jesse Berezovsky As we begin to look at how spin qubits might be integrated into a scalable platform, a promising strategy is to engineer the magnetic environment of the spins using micron- or nanometer-scale ferromagnetic (FM) elements, for functionalities such as nanoscale addressability, spin-wave mediated coupling, or enhanced sensing. The promise of these FM/spin interactions brings with it the question of how the coherence properties of the spin will be affected by coupling to these complex mesoscopic systems. To explore the physics of individual spins coupled to a proximal, dynamic ferromagnetic structure, we have studied interactions between individual nitrogen-vacancy (NV) spins and a model FM system -- a vortex magnetization state. The complex, yet controllable, spin texture of a FM vortex, formed in a thin disk or nanowire, allows one to study different regimes of interaction with a nearby confined spin. The vortex core produces a large static dipole-like fringe field. The vortex state also displays discrete dynamic modes ranging from several 100 MHz to GHz. By applying an in-plane magnetic field, the position of the vortex core relative to the NV spin can be controlled with nanometer-scale resolution, and time resolution of 10s of nanoseconds. As the vortex core is translated into proximity with an NV spin, the fringe field from the core generates a large position-dependent spin splitting, permitting nanoscale spin addressability [1]. We also find that the dynamic interaction of the vortex, NV spin, and applied microwave field results in amplification of the Rabi transition rate by more than an order of magnitude. Finally, we explore how spin decoherence and relaxation mechanisms are enhanced as the vortex core approaches the NVs, with implications for proposed technology incorporating coherent spins and proximal FM elements. [1] Wolf, M. S., Badea, R., and Berezovsky, J. ``Fast, Nanoscale Addressability of Nitrogen-Vacancy Spins via Coupling to a Dynamic Ferromagnetic Vortex'' Nature Communications 7, (2016): 5. [Preview Abstract] |
Thursday, March 16, 2017 3:42PM - 4:18PM |
V24.00003: Detecting ferromagnetic dynamics using spinwave induced relaxation of NV spins in diamond Invited Speaker: Vidya Bhallamudi Nitrogen-Vacancy (NV) centers in diamond have emerged as a leading platform for an ultra-sensitive tool to study magnetic phenomena at the nanoscale. This is due to their atomic size and spin-sensitive fluorescence that enables sensitive transduction of magnetic signals into optical signals. Detection and spectroscopy of target spins or magnetization using the NV centers typically relies on resonant and pulsed manipulation of the NV spins. We have recently demonstrated a broadband modality for detecting ferromagnetic dynamics with NV-centers that uses a simple continuous wave protocol and does not rely on resonant manipulation of the NV spins themselves [1]. We found that the NV centers fluorescence responds to ferromagnetic dynamics at frequencies far from the NVs' intrinsic spin resonances. We investigated the mechanism for this surprising observation by measuring the effect of FMR excitation on the NV spin lifetime [2]. This study provides evidence that the decay and scattering of the driven FMR mode results in spinwaves that produce fluctuating dipolar fields at the NVs' resonance frequency and cause enhanced relaxation of the NV spins. We have measured ferromagnetic dynamics in diverse materials using this protocol [2] and have performed spectroscopy of various branches of magnetization dynamics [3]. This research could lead to a new method for studying relaxation processes in ferromagnets and extending this idea to scanned-probe sensing will offer a unique modality for nanoscale magnetic imaging. This work is done in collaboration with groups of P. C. Hammel, G. D. Fuchs and F. Y. Yang. [1] C. S. Wolfe, V. P. Bhallamudi, et. al., Phys. Rev. B 89, 180406(R), [2] M. R. Page et. al., arXiv:1607.07485 [cond-mat.mes-hall], [3] C. S. Wolfe et. al. Appl. Phys. Lett. 108, 232409 (2016) [Preview Abstract] |
Thursday, March 16, 2017 4:18PM - 4:54PM |
V24.00004: Application of nitrogen vacancy centers for imaging superconducting vortices and spin-relaxation based magnetic resonance probes Invited Speaker: Ania Jayich |
Thursday, March 16, 2017 4:54PM - 5:30PM |
V24.00005: Imaging complex magnetic textures with a single spin microscope Invited Speaker: Vincent Jacques In the past years, it was realized that the experimental methods allowing for the detection of single spins in the solid-state, which were initially developed for quantum information science, open new avenues for high sensitivity magnetometry at the nanoscale. In that spirit, it was recently proposed to use the electronic spin of a single nitrogen-vacancy (NV) defect in diamond as an atomic-sized magnetic field sensor [1,2]. This approach promises significant advances in magnetic imaging since it provides non-invasive, quantitative and vectorial magnetic field measurements, with an unprecedented combination of spatial resolution and magnetic sensitivity under ambient conditions.\\ \\In this talk, I will show how scanning-NV magnetometry can be used as a powerful tool for fundamental studies in nanomagnetism, focusing on chiral domain walls and magnetic skyrmions in ultrathin ferromagnetic wires and spin cycloids in multiferroic materials.\newline \\$[1]$ G. Balasubramanian et al., Nature 455, 648 (2008), J. Maze et al., Nature 455, 644 (2008).\newline \\$[2]$ L. Rondin et al., Rep. Prog. Phys. 77, 056503 (2014). [Preview Abstract] |
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