Magnetic Properties and THz Emission from Co/CoO/Pt and Ni/NiO/Pt Trilayers

• Published in: Nanomaterials (Basel, Switzerland) Vol. 14; no. 2; p. 215
• Main Authors: Kanistras, Nikolaos, Scheuer, Laura, Anyfantis, Dimitrios I, Barnasas, Alexandros, Torosyan, Garik, Beigang, René, Crisan, Ovidiu, Poulopoulos, Panagiotis, Papaioannou, Evangelos Th
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.01.2024; MDPI
• Subjects: antiferromagnetic films; Antiferromagnetism; Bilayers; Cobalt; Damping; Electromagnetism; Electrons; Emission analysis; Emissions; exchange bias; Experiments; Ferromagnetic resonance; Ferromagnetism; Interlayers; Lasers; Magnetic fields; Magnetic measurement; Magnetic properties; Magnetization reversal; nanomagnetism; Nickel compounds; Nickel oxides; Oxides; Phase transitions; Platinum; Radiation; Signal to noise ratio; Spectra; Spectroscopy; Spectrum analysis; Spintronics; Superconducting quantum interference devices; Temperature dependence; THz spintronics; transition metal oxides; Greece; Germany; THz spintronics; transition metal oxides; antiferromagnetic films; nanomagnetism; exchange bias
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano14020215

THz radiation emitted by ferromagnetic/non-magnetic bilayers is a new emergent field in ultra-fast spin physics phenomena with a lot of potential for technological applications in the terahertz (THz) region of the electromagnetic spectrum. The role of antiferromagnetic layers in the THz emission process is being heavily investigated at the moment. In this work, we fabricate trilayers in the form of Co/CoO/Pt and Ni/NiO/Pt with the aim of studying the magnetic properties and probing the role of very thin antiferromagnetic interlayers like NiO and CoO in transporting ultrafast spin current. First, we reveal the static magnetic properties of the samples by using temperature-dependent Squid magnetometry and then we quantify the dynamic properties with the help of ferromagnetic resonance spectroscopy. We show magnetization reversal that has large exchange bias values and we extract enhanced damping values for the trilayers. THz time-domain spectroscopy examines the influence of the antiferromagnetic interlayer in the THz emission, showing that the NiO interlayer in particular is able to transport spin current.