Antiferromagnetic-coupling-induced magnetoresistance enhancement in Fex(TiO2)1−x films

Abstract

Fe-incorporated amorphous TiO2 films with different Fe volume fractions of 0.46⩽x⩽0.76 were deposited by cosputtering iron and Ti targets in an Ar+O2 mixture. X-ray diffraction and x-ray photoelectron spectroscopy analyses give a structure of nanosized Fe particles embedded in amorphous TiO2 matrix for the Fex(TiO2)1−x films. Magnetic measurements show antiferromagnetic coupling between nanoscaled Fe granules when x<0.60. The magnetoresistance of Fe0.46(TiO2)0.54 is about −7.6% at room temperature, which increases dramatically with decreasing temperature below ∼100K and reaches −29.3% at 3K. This significant enhancement of magnetoresistance can be qualitatively explained by antiferromagnetic coupling between Fe granules.

Multi‐Level Switching of Spin‐Torque Ferromagnetic Resonance in 2D Magnetite

“…[ 30 ] Albeit that Fe 3 O 4 bulk and thin films were reported to show antiphase boundaries (APBs) and spin textures, it remains unclear whether they emerge in 2D Fe 3 O 4 and how these structural defects can impose impact on their magnetoelectric and spin properties in reduced dimension. [ 31–33 ] In addition, spin transport and spin switching properties of 2D Fe 3 O 4 are yet to be explored despite of their crucial importance for ultrathin spintronic devices.…”

Shedding Phenomenon of Ventilated Partial Cavitation around an Underwater Projectile

“…The experimental system is a split Hopkinson pressure bar (SHPB) based launching device, [13] which can transiently accelerate the projectile and cause little disturbance in water tank. The details of the system has been reported elsewhere.…”