Measuring broadband magnetic fields on the nanoscale using a hybrid quantum register.
The generation and control of fast switchable magnetic fields with large gradients on the nanoscale is of fundamental interest in material science and for a wide range of applications. However, it has not yet been possible to characterize those fields at high bandwidth with arbitrary orientations. Here, we measure the magnetic field generated by a hard-disk-drive write head with high spatial resolution and large bandwidth by coherent control of single electron and nuclear spins. We are able to derive field profiles from coherent spin Rabi oscillations close to the gigahertz range, measure magnetic field gradients on the order of 1 mT nm-1and quantify axial and radial components of a static and dynamic magnetic field independent of its orientation. Our method paves the way for precision measurement of the magnetic fields of nanoscale write heads, which is important for future miniaturization of these devices.
3. Physikalisches Institut, Universität Stuttgart and Institute for Integrated Quantum Science and Technology IQST, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Ingmar
I
Jakobi
3. Physikalisches Institut, Universität Stuttgart and Institute for Integrated Quantum Science and Technology IQST, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Philipp
0000-0003-2146-0412
P
Neumann
3. Physikalisches Institut, Universität Stuttgart and Institute for Integrated Quantum Science and Technology IQST, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Ya
Y
Wang
3. Physikalisches Institut, Universität Stuttgart and Institute for Integrated Quantum Science and Technology IQST, Pfaffenwaldring 57, 70569 Stuttgart, Germany.|Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.
Durga Bhaktavatsala Rao
DB
Dasari
Seagate Technology, 1 Disc Drive, Springtown Industrial Estate, Londonderry BT48 0BF, UK.
Fadi
F
El Hallak
Seagate Technology, 1 Disc Drive, Springtown Industrial Estate, Londonderry BT48 0BF, UK.
Muhammad Asif
MA
Bashir
Element Six, Fermi Avenue, Harwell Oxford, Didcot, Oxfordshire OX11 0QR, UK.
Matthew
M
Markham
Element Six, Fermi Avenue, Harwell Oxford, Didcot, Oxfordshire OX11 0QR, UK.
Andrew
A
Edmonds
Element Six, Fermi Avenue, Harwell Oxford, Didcot, Oxfordshire OX11 0QR, UK.
Daniel
D
Twitchen
3. Physikalisches Institut, Universität Stuttgart and Institute for Integrated Quantum Science and Technology IQST, Pfaffenwaldring 57, 70569 Stuttgart, Germany.|Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.
Jörg
J
Wrachtrup