Details

Autor(en) / Beteiligte

• Reeves, Daniel B
• Weaver, John B

Titel

Combined Néel and Brown rotational Langevin dynamics in magnetic particle imaging, sensing, and therapy

Ist Teil von

• Applied physics letters, 2015-11, Vol.107 (22), p.223106-223106

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2015

Link zum Volltext

Quelle

American Institute of Physics (AIP) Journals

Beschreibungen/Notizen

• Magnetic nanoparticles have been studied intensely because of their possible uses in biomedical applications. Biosensing using the rotational freedom of particles has been used to detect biomarkers for cancer, hyperthermia therapy has been used to treat tumors, and magnetic particle imaging is a promising new imaging modality that can spatially resolve the concentration of nanoparticles. There are two mechanisms by which the magnetization of a nanoparticle can rotate, a fact that poses a challenge for applications that rely on precisely one mechanism. The challenge is exacerbated by the high sensitivity of the dominant mechanism to applied fields. Here, we demonstrate stochastic Langevin equation simulations for the combined rotation in magnetic nanoparticles exposed to oscillating applied fields typical to these applications to both highlight the existing relevant theory and quantify which mechanism should occur in various parameter ranges.