Electrical properties of single crystal Yttrium Iron Garnet ultra-thin films at high temperatures - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2018

Electrical properties of single crystal Yttrium Iron Garnet ultra-thin films at high temperatures

Laurent Vila
Alain Marty
Ariel Brenac
Jamal Ben Youssef
Olivier Klein

Résumé

We report a study on the electrical properties of 19 nm thick Yttrium Iron Garnet (YIG) films grown by liquid phase epitaxy. The electrical conductivity and Hall coefficient are measured in the high temperature range [300,400]~K using a Van der Pauw four-point probe technique. We find that the electrical resistivity decreases exponentially with increasing temperature following an activated behavior corresponding to a band-gap of $E_g\approx 2$ eV, indicating that epitaxial YIG ultra-thin films behave as large gap semiconductor, and not as electrical insulator. The resistivity drops to about $5\times 10^3$~$\Omega \cdot \text{cm}$ at $T=400$ K. We also infer the Hall mobility, which is found to be positive ($p$-type) at 5 cm$^2$/(V$\cdot$sec) and about independent of temperature. We discuss the consequence for non-local transport experiments performed on YIG at room temperature. These electrical properties are responsible for an offset voltage (independent of the in-plane field direction) whose amplitude, odd in current, grows exponentially with current due to Joule heating. These electrical properties also induce a sensitivity to the perpendicular component of the magnetic field through the Hall effect. In our lateral device, a thermoelectric offset voltage is produced by a temperature gradient along the wire direction proportional to the perpendicular component of the magnetic field (Righi-Leduc effects).

Dates et versions

hal-01614816 , version 1 (11-10-2017)

Identifiants

Citer

Nicolas M. Thiéry, Vladimir V. Naletov, Laurent Vila, Alain Marty, Ariel Brenac, et al.. Electrical properties of single crystal Yttrium Iron Garnet ultra-thin films at high temperatures. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2018, 97, pp.064422. ⟨hal-01614816⟩
507 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More