Magnetoresistance characteristics in individual Fe3O4 single crystal nanowire

Abstract

We report on the magnetoresistance (MR) and electron transport measurements observed on a single crystal magnetite nanowire prepared using a hydrothermal synthesis method. High-resolution electron microscopy revealed the single crystal magnetite nanowires with 80–120 nm thickness and up to 8 μm in length. Magnetic measurements showed the typical Verwey transition around 120 K with a 100 Oe room temperature coercivity and 45 emu/g saturation magnetization, which are comparable to bulk magnetite. Electrical resistance measurements in 5–300 K temperature range were performed by scanning gate voltage and varying applied magnetic field. Electrical resistivity of the nanowire was found to be around 5 × 10−4 Ω m, slightly higher than the bulk and has activation energy of 0.07 eV. A negative MR of about 0.7% is observed for as-synthesized nanowires at 0.3 T applied field. MR scaled with increasing applied magnetic field representing the field-induced alignment of magnetic domain. These results are attributed to the spin-polarized electron transport across the antiphase boundaries, which implicate promising applications for nanowires in magnetoelectronics.

Thermal Route for the Synthesis of Maghemite/Hematite Core/Shell Nanowires

“…Biomedical applications also take advantage of the elongated geometry and the magnetic response of iron oxide NWs to external magnetic fields, together with the recent studies that do not show any additional toxicity related to the wirelike geometry. , In fact, they have already shown their potentiality in axonal and cell guidance , and hyperthermia treatments, , among other applications. Spin-dependent transport measurements carried out in iron oxide NWs , have also shown the potentiality of these nanomaterials in spintronics. Template-assisted electrodeposition is one of the most suitable techniques for the controlled growth of NWs .…”

“…4,5 In fact, they have already shown their potentiality in axonal and cell guidance 6,7 and hyperthermia treatments, 8,9 among other applications. Spin-dependent transport measurements carried out in iron oxide NWs 10,11 have also shown the potentiality of these nanomaterials in spintronics. Template-assisted electrodeposition is one of the most suitable techniques for the controlled growth of NWs.…”

Efecto de la concentración de magnetita en la estructura, propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster

“…Tras alcanzar el valor máximo, la magnetización decrece tenuemente, pero esta vez no es debido a una transición de fase estructural sino a las fluctuaciones térmicas de los momentos magnéticos del material. Se espera que esta tendencia continúe hasta la temperatura de Curie de la magnetita: TC≈853 K [35], temperatura a la que desaparecen los estados de magnetización espontánea porque la energía térmica destruye las fuerzas de acoplamiento de espín y la magnetita se torna completamente paramagnética.…”

Structural and magnetic anisotropy in the epitaxial FeV2O4 (110) spinel thin films

“…Our negative MR may arise from the magnetic suppressing of the spin fluctuation across the grain boundary, 24,25 or through spinel antiphase boundary. 26 Obviously, further work is needed to clarify the underlying mechanism.…”