TY - JOUR

T1 - Magnetization Dynamics of an Individual Single-Crystalline Fe-Filled Carbon Nanotube

AU - Lenz, Kilian

AU - Narkowicz, Ryszard

AU - Wagner, Kai

AU - Reiche, Christopher F.

AU - Körner, Julia

AU - Schneider, Tobias

AU - Kákay, Attila

AU - Schultheiss, Helmut

AU - Weissker, Uhland

AU - Wolf, Daniel

AU - Suter, Dieter

AU - Büchner, Bernd

AU - Fassbender, Jürgen

AU - Mühl, Thomas

AU - Lindner, Jürgen

N1 - Funding information: The authors thank Siegfried Menzel and Thomas Gemming for supporting the FIB preparation work and Jürgen Thomas for the TEM imaging. D.W. has received funding from the European Research Council (ERC) under the Horizon 2020 research and innovation program of the European Union (Grant no. 715620). This work was funded by the Deutsche Forschungsgemeinschaft (DFG) (Grant Nos. MU1794/3-2, SU192/30-1, and SU192/30-2). Support by the Nanofabrication Facilities Rossendorf at IBC are gratefully acknowledged.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - The magnetization dynamics of individual Fe-filled multiwall carbon-nanotubes (FeCNT), grown by chemical vapor deposition, are investigated by microresonator ferromagnetic resonance (FMR) and Brillouin light scattering (BLS) microscopy and corroborated by micromagnetic simulations. Currently, only static magnetometry measurements are available. They suggest that the FeCNTs consist of a single-crystalline Fe nanowire throughout the length. The number and structure of the FMR lines and the abrupt decay of the spin-wave transport seen in BLS indicate, however, that the Fe filling is not a single straight piece along the length. Therefore, a stepwise cutting procedure is applied in order to investigate the evolution of the ferromagnetic resonance lines as a function of the nanowire length. The results show that the FeCNT is indeed not homogeneous along the full length but is built from 300 to 400 nm long single-crystalline segments. These segments consist of magnetically high quality Fe nanowires with almost the bulk values of Fe and with a similar small damping in relation to thin films, promoting FeCNTs as appealing candidates for spin-wave transport in magnonic applications.

AB - The magnetization dynamics of individual Fe-filled multiwall carbon-nanotubes (FeCNT), grown by chemical vapor deposition, are investigated by microresonator ferromagnetic resonance (FMR) and Brillouin light scattering (BLS) microscopy and corroborated by micromagnetic simulations. Currently, only static magnetometry measurements are available. They suggest that the FeCNTs consist of a single-crystalline Fe nanowire throughout the length. The number and structure of the FMR lines and the abrupt decay of the spin-wave transport seen in BLS indicate, however, that the Fe filling is not a single straight piece along the length. Therefore, a stepwise cutting procedure is applied in order to investigate the evolution of the ferromagnetic resonance lines as a function of the nanowire length. The results show that the FeCNT is indeed not homogeneous along the full length but is built from 300 to 400 nm long single-crystalline segments. These segments consist of magnetically high quality Fe nanowires with almost the bulk values of Fe and with a similar small damping in relation to thin films, promoting FeCNTs as appealing candidates for spin-wave transport in magnonic applications.

KW - Brillouin light scattering

KW - carbon nanotubes

KW - ferromagnetic nanotubes

KW - ferromagnetic resonance

KW - micromagnetism

UR - http://www.scopus.com/inward/record.url?scp=85074846815&partnerID=8YFLogxK

U2 - 10.1002/smll.201904315

DO - 10.1002/smll.201904315

M3 - Article

C2 - 31709700

AN - SCOPUS:85074846815

VL - 15

JO - SMALL

JF - SMALL

SN - 1613-6810

IS - 49

M1 - 1904315

ER -