Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 62: Magnetic Imaging (Experimental Techniques)
MA 62.4: Vortrag
Freitag, 24. März 2017, 10:15–10:30, HSZ 403
Measuring broadband magnetic fields on the nanoscale using a hybrid quantum register — •Ingmar Jakobi1, Sven Bodenstedt1, Fadi El Hallak2, Muhammad Asif Bashir2, Ya Wang1, Durga B. R. Dasari1, Philipp Neuamnn1, and Jörg Wrachtrup1 — 13. Physikalisches Institut, Universität Stuttgart — 2Seagate Technology
Modern hard disk recording heads are the product of decades of development and a marvel of engineering. A microscopic electromagnet is able to flip the magnetization of a 20 nm wide bit on the recording medium while it flies by at 10000 rpm. This implies that the produced magnetic fields are strong (B ~ 1T), fast (GHz bandwidth) and especially local. Gradients of up to 10 mT/nm are among the strongest that mankind can produce. However these devices have been miniaturized beyond the capabilities of conventional sensors which impairs further development.
Here we present a suitable magnetometer that can resolve the magnetic field of recording heads on the nanoscale. Single nitrogen-vacancy (NV) defect centers in diamond can measure a broad range of field strengths and frequencies. As their spin is mostly confined to a single lattice site the detection volume is on the atomic scale and the spatial resolution only depends on the positioning of the host diamond. In return the unique features of recording heads are of particular interest for spin research ranging from nanoscale magnetic resonance imaging to quantum information processing.
[1] I. Jakobi et al., Nature Nanotechnology, 2016