Flexible planar Hall effect sensor with sub-200 pT resolution

Piezo Voltage Controlled Planar Hall Effect Devices

The electrical control of the magnetization switching in ferromagnets is highly desired for future spintronic applications. Here we report on hybrid piezoelectric (PZT)/ferromagnetic (Co2FeAl) devices in which the planar Hall voltage in the ferromagnetic layer is tuned solely by piezo voltages. The change of planar Hall voltage is associated with magnetization switching through 90° in the plane...

Sub-picowatt resolution calorimetry with a bi-material microcantilever sensor

Electric Control of the Hall effect in Pt/Bi0.9La0.1FeO3 bilayers

Platinum metal, being nonmagnetic and with a strong spin-orbit coupling interaction, has been deposited on weak ferromagnetic Bi0.9La0.1FeO3 thin films. The Hall effect is studied as a function of the polarization direction of multiferroic Bi0.9La0.1FeO3 thin films, as well as magnetic field (H) and temperature (T). For the two polarization directions, besides the obvious difference of the anom...

Quantum Hall effect in monolayer-bilayer graphene planar junctions

Jifa Tian,1,2,* Yongjin Jiang,1,3 Isaac Childres,1,2 Helin Cao,1,2 Jiangping Hu,1 and Yong P. Chen1,2,4,† 1Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA 2Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA 3Center for Statistical and Theoretical Condensed Matter Physics, and Department of Physics, Zhejiang Normal University, Jinhua 3...

Giant planar Hall effect in epitaxial (Ga,Mn)as devices.

Large Hall resistance jumps are observed in microdevices patterned from epitaxial (Ga,Mn)As layers when subjected to a swept, in-plane magnetic field. This giant planar Hall effect is 4 orders of magnitude greater than previously observed in metallic ferromagnets. This enables extremely sensitive measurements of the angle-dependent magnetic properties of (Ga,Mn)As. The magnetic anisotropy field...