Magnetic coupling of iron-based ferromagnetic nanoclusters encapsulated inside double-wall carbon nanotubes

Autor(en)

Wilson Nieto, Johnny Chimborazo, Hidetsugu Shiozawa, Thomas Pichler, Paola Ayala, Dario Niebieskikwiat

Abstrakt

Understanding the magnetic properties of hybrids of carbon nanotubes is an intriguing matter that offers a vastly unexplored playground for fundamental research and promising applications. The magnetic properties of bundles of double-wall carbon nanotubes encapsulating cementite ferromagnetic nanoclusters (of ∼ 3–4 nm in length) are here studied. VSM magnetometry shows clear evidence of interparticle magnetic interactions and a large interface exchange coupling of the nanoclusters with the carbon matrix, characterized by a surface anisotropy field HK∼67 kOe. Using a well-known measurement protocol, a magnetic activation volume for magnetization reversal was estimated as ∼420nm3. This large volume involves around 270 cementite nanoparticles mutually coupled through the conduction electrons of the nanotubes, which provide the ground for a large magnetic correlation length, thus favoring their possible application in spintronic devices.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Universidad San Francisco de Quito

Journal

Carbon Trends

Band

19

Anzahl der Seiten

6

ISSN

0008-6223

DOI

https://doi.org/10.1016/j.cartre.2025.100483

Publikationsdatum

04-2025

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Chemistry (miscellaneous), Materials Science (miscellaneous), Materials Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6faed187-676c-4dc9-a990-122707ad9062