title: Tracking temperature-dependent relaxation times of ferritin nanomagnets with a wideband quantum spectrometer.
abstract: We demonstrate the tracking of the spin dynamics of ensemble and individual magnetic ferritin proteins from cryogenic up to room temperature using the nitrogen-vacancy color center in diamond as a magnetic sensor. We employ different detection protocols to probe the influence of the ferritin nanomagnets on the longitudinal and transverse relaxation of the nitrogen-vacancy center, which enables magnetic sensing over a wide frequency range from Hz to GHz. The temperature dependence of the observed spectral features can be well understood by the thermally induced magnetization reversals of the ferritin and enables the determination of the anisotropy barrier of single ferritin molecules.
authors.affiliation: Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany and 3rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart, Germany.
authors.forename: Eike
authors.initials: E
authors.lastname: Schäfer-Nolte
authors.affiliation: Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany and 3rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart, Germany.
authors.forename: Lukas
authors.initials: L
authors.lastname: Schlipf
authors.affiliation: Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Ternes
authors.affiliation: 3rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart, Germany.
authors.forename: Friedemann
authors.initials: F
authors.lastname: Reinhard
authors.affiliation: Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany and Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Klaus
authors.initials: K
authors.lastname: Kern
authors.affiliation: Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany and 3rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Wrachtrup