Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Experimental methods and magnetic imaging

MA 30.6: Talk

Wednesday, April 2, 2014, 16:30–16:45, HSZ 403

Ultra sensitive magnetic field sensing with single electron spin — •Andrii Lazariev¹, Ganesh Rahane¹, Perunthiruthy Madhu², and Gopalakrishnan Balasubramanian¹ — ¹Max Planck Research Group "Nanoscale Spin Imaging", Max Planck Institute for Biophysical Chemistry, Göttingen, Germany — ²Dept. of Chemical Sciences, TIFR, Mumbai, India

We present an experimental method for the micro- and nanotesla magnetic field measurements using a Nitrogen-Vacancy defect in diamond lattice. The Nitrogen-Vacancy (NV) center in diamond is a lattice defect which appears when a carbon atom is replaced with a nitrogen atom and has a missing lattice node nearby. It can be represented as a pseudo 1/2-spin and sustain its state manipulations under optical or microwave exposure. The NV-center has been proved as a stable nanoscale probe for weak magnetic field. Present work studies a method of Fourier spectroscopy based on modified Phase-Modulated Lee-Goldburg sequence. The study demonstrate the variation of the probe sensitivity to the external magnetic fields and introduces an algorithm based on PMLG sequence allowing to provide the spectra measurements of a multi-frequency (kHz-scale) ultra-weak (uT) magnetic fields.