Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M15: Keithley Award SymposiumInvited Live Streamed Prize/Award
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Sponsoring Units: GIMS Chair: Chris Jacobsen, Argonne National Laboratory Room: McCormick Place W-183C |
Wednesday, March 16, 2022 8:00AM - 8:36AM |
M15.00001: Keithley Award (2022): Pushing the Limits of Nanoscale Magnetic Resonance: From Magnetic Force Microscopy to Single Electron Spin Detection Invited Speaker: Daniel Rugar The invention of the atomic force microscope by Binnig, Quate and Gerber[1] was a key development in nanoscience and inspired many other cantilever-based force detection modalities. One of the most important modalities is magnetic force microscopy, which has become a standard technique widely used for the study of magnetic materials and spintronic devices. I will describe some of the early efforts in magnetic force microscopy and its evolution toward ever increasing sensitivity. A key inspiration for our work came from John Sidles (Univ. of Washington) who suggested that force detection techniques might be applied to magnetic resonance detection and possibly achieve three-dimensional imaging of molecules[2]. Motivated by this possibility, our group at IBM-Almaden pushed the sensitivity of cantilever-based force detection to the attonewton level, allowing the detection of a single electron spin and, later, nanoscale nuclear spin imaging. This talk will give a personal perspective of this research journey. Various innovations developed along the way will be highlighted, as well as some of the remaining challenges. |
Wednesday, March 16, 2022 8:36AM - 9:12AM |
M15.00002: Keithley Award (2022): Pushing the Limits of Nanoscale Magnetic Resonance: Nuclear Spin Detection and Imaging Invited Speaker: Harry J Mamin In 2004, Rugar and coworkers demonstrated the detection of magnetic resonance on a single electron spin using magnetic resonance force microscopy. This work represented an important milestone, yet the most exciting potential applications for nanoscale magnetic resonance rely on detecting and imaging nuclear spins, such as the hydrogen nuclei in organic samples. The roughly 650 times smaller nuclear magnetic moment compared to the electron makes this especially challenging. I will describe our three-dimensional nuclear magnetic resonance imaging of tobacco mosaic viruses with a spatial resolution of roughly 10 nm, and the obstacles to pushing beyond this limit with force detection. An alternative approach based on nitrogen vacancy centers in diamond offers room temperature operation and single spin sensitivity for nearby nuclei. This talk will include both our own work and that from others in the nano-MRI community, as well as some personal perspectives gained from working on these projects over the course of my years at IBM. |
Wednesday, March 16, 2022 9:12AM - 9:48AM |
M15.00003: Invited Talk: Peter Grutter Invited Speaker: Peter H Grutter TBD |
Wednesday, March 16, 2022 9:48AM - 10:24AM |
M15.00004: From Nanomechanics to Spins Invited Speaker: Christian L Degen Nanomechanical resonators are exquisite sensors for weak magnetic forces, with exciting prospects in nanoscale detection and imaging of nuclear and electronic spins. In this talk, I will give an overview of our laboratory's activities in this field, including force detection with optomechanical membranes and strings, and nuclear spin imaging with the technique of magnetic resonance force microscopy. |
Wednesday, March 16, 2022 10:24AM - 11:00AM |
M15.00005: Angstrom-Scale Nuclear Magnetic Resonance Diffraction: A Route to Atomic Resolution Magnetic Resonance Imaging Invited Speaker: Raffi Budakian Achieving atomic resolution is the ultimate limit of magnetic resonance imaging (MRI), and attaining this capability offers huge technological and scientific opportunities, from drug development to understanding the complex dynamics in interacting quantum systems. In this talk, I will present nuclear magnetic resonance diffraction (NMRd) – a new approach for achieving three-dimensional atomic resolution imaging of nuclear spins in crystalline solids. First proposed by Mansfield and Grannell1 , NMRd extends Fourier transform MRI to a periodic arrangement of spins to yield structure factor information with elemental specificity and atomic resolution, without the loss of phase information common to scattering techniques such as X-rays that detect the scattered field intensity. In this talk, I will present two recent results that utilize a force-detected nano-MRI apparatus to realize NMRd of P-spins in an InP nanowire. In the first experiment, we imprint a nanometer scale grating by periodically modulating the Z magnetization of P-spins, and detect the period and position of the grating with sub-Angstrom precision. In the second experiment, we vary the period of the grating from approximately 2 Å to 10 nm and study the transport of spin correlations under the dipolar interactions of the P-spins. We find that the transport in the Z magnetization is diffusive on lengthscales greater than about 2 nm and transitions to a ballistic transport regime below 2 nm. I will end the talk by describing upcoming work to extend the capabilities NMRd to image three-dimensional arrangement of spins in nanocrystalline solids |
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