Ferromagnetic Resonance Studies in Magnetic Nanosystems

Magnetochemistry

Carlos Quirós¹  Javier Díaz¹  Aurelio Hierro-Rodríguez¹  Luis Manuel Álvarez-Prado¹  Ko-Wei Lin²  Jong-Ching Wu³  Daniel Markó⁴  David S. Schmool⁴ 

[1] Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, 33007 Oviedo, Spain;Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan;Department of Physics, National Changhua University of Education, Changhua 500, Taiwan;GEMaC, CNRS, UVSQ, Université Paris-Saclay, 78035 Versailles, France;

关键词: ferromagnetic resonance;    magnetization dynamics;    magnetic nanodots;    coupled magnetic thin films;    perpendicular magnetic anisotropy;   

DOI  :  10.3390/magnetochemistry7090126

来源: DOAJ

【 摘 要 】

Ferromagnetic resonance is a powerful method for the study of all classes of magnetic materials. The experimental technique has been used for many decades and is based on the excitation of a magnetic spin system via a microwave (or rf) field. While earlier methods were based on the use of a microwave spectrometer, more recent developments have seen the widespread use of the vector network analyzer (VNA), which provides a more versatile measurement system at almost comparable sensitivity. While the former is based on a fixed frequency of excitation, the VNA enables frequency-dependent measurements, allowing more in-depth analysis. We have applied this technique to the study of nanostructured thin films or nanodots and coupled magnetic layer systems comprised of exchange-coupled ferromagnetic layers with in-plane and perpendicular magnetic anisotropies. In the first system, we have investigated the magnetization dynamics in Co/Ag bilayers and nanodots. In the second system, we have studied Permalloy (Ni${}_{80}$Fe${}_{20}$, hereafter Py) thin films coupled via an intervening Al layer of varying thickness to a NdCo film which has perpendicular magnetic anisotropy.

【 授权许可】

Unknown