Magnetic properties of single nanomagnets: EMCD on FePt nanoparticles

Abstract

Energy-loss magnetic chiral dichroism (EMCD) allows for the quantification of magnetic properties of materials at the nanometer scale. It is shown that with the support of simulations that help to identify the optimal conditions for a successful experiment and upon implementing measurement routines that effectively reduce the noise floor, EMCD measurements can be pushed towards quantitative magnetic measurements even on individual nanoparticles. With this approach, the ratio of orbital to spin magnetic moments for the Fe atoms in a single L$1_0$ ordered FePt nanoparticle is determined to be $m_l/m_s=0.08\pm 0.02$. This finding is in good quantitative agreement with the results of XMCD ensemble measurements.

35 pages, 10 figures

References in corpus (2)

• Sum-rules for electron energy-loss near-edge spectra
• Quantitative magnetic information from reciprocal space maps in transmission electron microscopy

Cited by in corpus (4)

• Induction Mapping of the 3D-Modulated Spin Texture of Skyrmions in Thin Helimagnets
• EMCD with an electron vortex filter: Limitations and possibilities
• Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods
• Proposal for measuring magnetism with patterned apertures