NanoSQUID detection of magnetization from ferritin nanoparticles

Vohralik, Peter; Lam, Siu Shu Eddie

doi:10.1088/0953-2048/22/6/064007

Cited by 28 publications

(28 citation statements)

References 53 publications

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“…[3][4][5] Recently, preliminary measurements of magnetization from ferritin nanoparticles have been reported. 6 In order to reach the suitable sensitivity, the SQUID loop dimension has to be as small as possible ͑100-200 nm͒, requiring Josephson junctions having deep submicron size. Due to the limits of the fabrication process, tunnel Josephson Junctions, cannot be employed in such nano-SQUIDs.…”

Section: Introductionmentioning

confidence: 99%

Performance of nano superconducting quantum interference devices for small spin cluster detection

Granata

Vettoliere

Walke

et al. 2009

Journal of Applied Physics

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In the present paper, performance of nano-superconducting-quantum-interference devices (SQUIDs) has been investigated in view of their employment in the detection of small spin populations. The analysis has been focused on nano-SQUID sensors having a square loop with a side length of 200 nm. We calculate the spin sensitivity and the magnetic response relative to the single Bohr magneton (single spin), as a function of its position within the SQUID hole. The results show that the SQUID response depends strongly on the spin position; the ratio between the spin sensitivity evaluated in the center of the loop and the minimum one is as high as a factor of 3 for a spin at a reasonable distance z′ of 10 nm from the SQUID plane. Furthermore, the magnetic flux due to several hundred of spins has been evaluated by considering different random spin distributions within the SQUID hole. Due to the both nonuniform SQUID response and the random distribution process, the results show a statistical uncertainty which has been evaluated as a function of the spin number. The estimated informations are very useful to optimize the sensor performance in view of the most nanomagnetism applications.

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Section: Introductionmentioning

confidence: 99%

Performance of nano superconducting quantum interference devices for small spin cluster detection

Granata

Vettoliere

Walke

et al. 2009

Journal of Applied Physics

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“…Furthermore, individual magnetic nano-objects have been investigated by scanning probe microscopy [9, 10], micro-SQUIDs [11,12] or scanning X-ray microscopy [13]. In general these techniques have a limited detection bandwidth, such that the experimental observation of magnetic fluctuations in a wide frequency range relies on stitched measurements combining complementary techniques in different frequency domains.…”

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confidence: 99%

Tracking Temperature-Dependent Relaxation Times of Ferritin Nanomagnets with a Wideband Quantum Spectrometer

et al. 2014

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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 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. The study of magnetic fluctuations -time-dependent deviations of a magnetic system from equilibrium -is of high intrinsic interest and provides a powerful tool to gain insight into magnetic coupling mechanisms [1, 2]. Experimentally, however, access to fluctuations is frequently challenging, owing to two reasons: Firstly, fluctuations can extend over an excessively large range of frequencies. Secondly, many relevant magnetic systems are small entities with dimensions in the nanometer range, such as single molecules, clusters, or magnetic domains. Hence, the study of magnetic fluctuations requires a measurement technique featuring simultaneously nanoscale resolution and a wide frequency bandwidth.Widely used methods to study ensembles of magnetic nanosystems are SQUID magnetometry [3,4], Mößbauer spectroscopy [5], electron spin resonance [6], neutron scattering [7], or X-ray magnetic circular dichroism [8]. Furthermore, individual magnetic nano-objects have been investigated by scanning probe microscopy [9, 10], micro-SQUIDs [11,12] or scanning X-ray microscopy [13]. In general these techniques have a limited detection bandwidth, such that the experimental observation of magnetic fluctuations in a wide frequency range relies on stitched measurements combining complementary techniques in different frequency domains.Here we show that the Nitrogen-Vacancy (NV) center in diamond employed as a magnetic field sensor [14,15] simultaneously provides access to both nanoscale objects and a frequency bandwidth spanning ten orders of magnitude. We use the unique properties of the NV to monitor thermal magnetization reversals of single biological nano-magnets from cryogenic to room temperature where these fluctuations accelerate from the sub-Hz to the GHz range.We study ferritin protein complexes adsorbed onto a diamond surface (Fig. 1a). Each of these proteins en- closes a cluster of up to 4500 Fe atoms wich net magnetic moment exhibits strong thermally activated fluctuations. We detect the magnetic stray field of these clusters with NV defect centers embedded 5-10 nm below the diamond surface. This center enables the precise determination of the local magnetic field via the Zeeman shift of its spin sublevels, which can be measured by optically detected magnetic resonance (ODMR) techniques. Due to its atomic size, an individual NV center can be pl...

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“…Field operation up to few 100 mT was improved by reducing the hole size down to 100 nm and the largest linewidths down to 250 nm 84 . Preliminary experiments were performed on ferritin nanoparticles attached to the cJJs 85 . However, the magnitude of the flux change observed in some cases (up to 440 µΦ 0 ) was larger than the expected one for a ferritin NP located at optimum position (up to 100 µΦ 0 ).…”

Section: Constriction Junctionsmentioning

confidence: 99%

Sample Preparation for Inorganic Trace Element Analysis

Matusiewicz¹

2017

Physical Sciences Reviews

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NanoSQUID detection of magnetization from ferritin nanoparticles

Cited by 28 publications

References 53 publications

Performance of nano superconducting quantum interference devices for small spin cluster detection

Performance of nano superconducting quantum interference devices for small spin cluster detection

Tracking Temperature-Dependent Relaxation Times of Ferritin Nanomagnets with a Wideband Quantum Spectrometer

Sample Preparation for Inorganic Trace Element Analysis

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