Magnetic Field Mapping Around Individual Magnetic Nanoparticle Agglomerates Using Nitrogen-Vacancy Centers in Diamond

Filipe Camarneiro, Juanita Bocquel, Juan Gallo, Manuel Bañobre-López, Kirstine Berg-Sørensen, Ulrik Lund Andersen, Alexander Huck, Jana B. Nieder*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

7 Downloads (Pure)

Abstract

A modified diamond–photonics based metrology is proposed to explore the magnetic fields created by agglomerates of magnetic nanoparticles (MNPs). MNPs are promising for environmental and medical applications; those proposed for cancer magnetic hyperthermia treatments are small superparamagnetic <20 nm iron oxide particles. Inside cells, they assemble in larger MNP agglomerates, reaching cross-sections of several micrometers. Here, these conditions are reproduced and MNP agglomerates immobilized. Optically detected magnetic resonance (ODMR) signals recorded without a bias field in a confocal microscope and scanning across a homogenous shallow layer of fluorescent nitrogen-vacancy centers in a bulk diamond sample placed in direct contact with the MNP agglomerates are used to determine magnetic fields with a spatial resolution of 500 nm in a lateral direction. This spatial resolution allows determining magnetic field maps around individual MNP agglomerates, for which magnetic fields with strengths ranging from 0.03 mT to maximal 1.2 mT in the direct vicinity of the agglomerates and with detectable fields up to 5 µm away from the agglomerates, are determined. Based on the findings, a pathway to non-invasively study the micro/nano topology of MNP agglomerates is proposed.

Original languageEnglish
Article number2100011
JournalParticle and Particle Systems Characterization
Volume38
Issue number8
Number of pages10
ISSN0934-0866
DOIs
Publication statusPublished - 2021

Keywords

  • Magnetic nanoparticles
  • NV center
  • Particles
  • Photonics
  • Quantum metrology
  • Sensing

Fingerprint

Dive into the research topics of 'Magnetic Field Mapping Around Individual Magnetic Nanoparticle Agglomerates Using Nitrogen-Vacancy Centers in Diamond'. Together they form a unique fingerprint.

Cite this