Domain structure and magnetic characterization of Tb/Co synthetic Ferrimagnets.

J. RODRIGUEZ E.; M. GUYON; L. AVILÉS-FÉLIX; S. AUFFRET; R. SOUSA; I. L. PREJBEANU; A. BRUCHHAUSEN; E. DE BIASI; CURIALE, J.

Puert Varas

Workshop; XII Latin American Workshop on Magnetism, Magnetic Materials, & their Applications (LAW3M) 2023 OCTOBER 16 - 20 PUERTO VARAS, CHILE.; 2023

Universidad Técnica Federico Santa María

In ferromagnetic materials, the ability to modify different parameters and thus tune their magnetic properties is essential for the development of different spintronic and optoelectronic devices such as magnetic memories, high-frequency oscillators, etc. [1, 2]. Moreover, in ferrimagnetic materials (FiM) it was observed a more complex scenario; which make their applications even more interesting. Depending on its composition, there is a magnetic compensation temperature (T M) and also an angular compensation temperature (TA) [3].This fact, which is a fingerprint of the FiM materials, remarkably enriches the physics of this kind of systems. To understand to the magnetization dynamics of ferro- and ferrimagnetic thin film is highly relevant from the fundamental and applied point of view. One of the techniques used to characterize the dynamics is the time-resolved magneto-optical Kerr effect (TR-MOKE), which explores the evolution of magnetization using ultra-fast pulsed lasers that operates in a time window ranging from 10-14 s (tens of fs) up to 10 -8 s (tens of ns). In this work, we present the first results of magnetic characterization of a series of Tb/Co ferrimagnetic multilayers with perpendicular magnetic anisotropy (PMA). We show how the magnetic compensation temperature (TM) changes as a function of composition and how it correlates with the domain structure as well as the dynamics of the domain walls. We also present the most relevant advances in the development of a TR-MOKE magnetometer facility at Bariloche Atomic Center.