Ultra-low magnetic damping in epitaxial Li0.5Fe2.5O4 thin films

Abstract

The realization of more energy efficient nanomagnetic information devices relies on the existence of magnetic insulators capable of supporting pure spin currents in the absence of a dissipative charge current. Currently, there is a limited number of thin-film magnetic insulators with low magnetic damping. Li0.5Fe2.5O4 (LFO) is well known to possess the lowest damping among the bulk spinel structure oxides, but, thus far, LFO thin films have not lived up to these expectations. Here, we demonstrate low magnetic damping (even lower than typical bulk values) and bulk magnetization in 3 nm thick epitaxial LFO thin films. At room temperature, SQUID magnetometry shows a high saturation magnetization of 320 kA/m, and broadband ferromagnetic resonance measurements yield an effective Gilbert damping parameter of 1.3×10−3, which is among the lowest reported for ferro-/ferrimagnetic films of comparable thickness. Our results show the promise of LFO as a candidate material for spin current-based spintronics.

Hybrid spin Hall nano-oscillators based on ferromagnetic metal/ferrimagnetic insulator heterostructures

“…Sample deposition and fabrication. Epitaxial Li 0.5 Al 47,48 . After the growth of the ferrite thin films of various thicknesses and compositions, Py(5 nm)/Pt(5 nm) bilayers are deposited on LAFO and LFO via a Kurt Lester magnetron sputtering system at room temperature.…”

Optimization of magnetic properties of BaTiO3/Li0.5Fe2.5O4 multiferroics prepared via modified low-temperature combustion

“…On the other hand, multiferroic nanocomposite is an important class of nanocomposite that have become in attention because of their promising applications such as in energy conversion, fuel cells, storage, shape memory actuation and solidstate refrigeration, next-generation spintronics devices or multiple state memory elements, and transducers with magnetically modulated piezoelectricity [1][2][3][4][5][6][7]. In particular, biferroic is a class of multiferroics that shows the simultaneous ferroelectric and ferromagnetic order parameters [8]. Generally, the concept of multiferroic stands for the presence of an interaction between the ferroelectric and ferromagnetic subsystems.…”

“…The ferroelectric behavior of BTO is arising from the crystal asymmetry which is associated with the displacement of Ti ion from its body-centered positions in the crystal lattice [11,12]. Zheng et al reported that BTO NPs can enhance the multifunctional properties of Li 0.5-Fe 2.5 O 4 [8].…”

Electrical, electronic and magnetic property correlation via oxygen vacancy filling and scaling-law analysis in LiFe5O8 thin films prepared by pulsed laser deposition

“…13 LiFe 5 O 8 thin films have been prepared by various physical and chemical vapor deposition techniques and their structural and magnetic properties have been reported by a few research groups. [14][15][16] Detailed studies on the temperature and frequency dependent electrical properties and the effect of thickness on the optical band gap tuning properties and controlling the band edge parameters through oxygen vacancy filling in LiFe 5 O 8 thin films have not been performed in the literature. In the present work, we have deposited LiFe 5 O 8 thin films on Al 2 O 3 (0001) substrates by the pulsed laser deposition method and explored the thickness-dependent optical, electronic and electrical properties correlated with the band edge parameters.…”

“…13 LiFe 5 O 8 thin films have been prepared by various physical and chemical vapor deposition techniques and their structural and magnetic properties have been reported by a few research groups. 14–16…”