Fig. 1 Sensing scheme with an atomic spin sensor.

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Date of download: 7/11/2016 Copyright © 2016 SPIE. All rights reserved. Typical temperature increase inside (solid line) and on the surface (dashed line)

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Presentation transcript:

Fig. 1 Sensing scheme with an atomic spin sensor. Sensing scheme with an atomic spin sensor. (A) Schematic of the experimental setup. The Fe trimer spin sensor (orange) and a nano-antiferromagnet (green) are assembled from individual Fe atoms on a Cu2N/Cu(100) surface (Cu, yellow circles; N, blue circles) and interact weakly with each other. The spin-polarized probe tip of an STM (gray) is polarized by an external magnetic field (purple arrow). A series of pump and probe voltage pulses are sent to the tip and stroboscopically measure the spin relaxation time of the spin sensor. Coordinate system: z (easy magnetic axis of Fe atoms in the Fe trimer), x (hard magnetic axis). (B) Top: Spin-polarized STM topographs of the Fe trimer spin sensor and the Fe nano-antiferromagnet that switches between two Néel states (labeled “0” and “1”). The distance between the Fe trimer and nano-antiferromagnet is 3.0 nm. Image size, 6.6 × 6.6 nm2; color, from low (black) to high (white); tunnel junction set point, 5 mV and 50 pA. Bottom: Pump-probe spectra of Fe trimer for the nano-antiferromagnet in Néel state “0” (red dots) or “1” (blue dots). Tip position is marked by a cross in the top panel. Pulse amplitude and duration: pump pulse, 8 mV and 80 ns; probe pulse, 3 mV and 100 ns. Solid lines are exponential decay fits to the experimental data showing that the spin relaxation time of Fe trimer differs by ΔT1 between the two curves. (C) Sketch of the avoided level crossing of the Fe trimer’s low-energy spin states, |φ〉 and |ρ〉, that enables spin sensing. Changes in the magnetic field modify the energy splitting of the spin states and the transition rate between them (blue and red arrows), thus modifying T1 by ΔT1. Any other magnetic perturbation that modifies the spin states also results in a ΔT1. (D) Time traces of the pump-probe signal measured on Fe trimer showing two-state switching of the nearby nano-antiferromagnet. The signal amplitude diminishes with increasing delay time between the pump and probe pulses [chosen delay times are indicated by vertical lines in (B)]. Magnetic bias field, 0.25 T; temperature, 0.5 K. Shichao Yan et al. Sci Adv 2017;3:e1603137 Copyright © 2017, The Authors