Publications de Junfeng Hu | EPFL Graph Search

Control of spin currents by magnon interference in a canted antiferromagnet

Jean-Philippe Ansermet, Peng Chen, Dirk Grundler, Keita Yamamoto, Junfeng Hu

Controlling the spin current lies at the heart of spintronics and its applications. In ferromagnets, the sign of spin currents is fixed once the current direction is determined. However, spin currents in antiferromagnets can possess opposite polarizations, ...

Springer Science and Business Media LLC2025

Large Anomalous Nernst Angle in Co2MnGa Thin Film

Jean-Philippe Ansermet, Simon Granville, Haiming Yu, Song Liu, Junfeng Hu, Yao Zhang

The new trends for anomalous Nernst effect (ANE)-based thermoelectric devices require materials with large ANE values to realize the scalable generation of voltage. Recently, very large ANE values have been observed in single crystals of some novel magneti ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2022

Strong temperature-dependent thermoelectric power of IrMn(3)thin films of different thicknesses

Jean-Philippe Ansermet, Haiming Yu, Junfeng Hu, Mukund Krishna Kothari

IrMn(3)thin films were experimentally characterized by thermoelectric power and resistivity as a function of temperature and sample thickness. The Seebeck coefficient shows strong temperature dependence and the value increases with temperature up to 350 K. ...

IOP PUBLISHING LTD2021

Record thermopower found in an IrMn-based spintronic stack

Jean-Philippe Ansermet, Haiming Yu, Song Liu, Peng Gao, Sa Tu, Junfeng Hu, Jianyu Zhang, Yao Zhang

The Seebeck effect converts thermal gradients into electricity. As an approach to power technologies in the current Internet-of-Things era, on-chip energy harvesting is highly attractive, and to be effective, demands thin film materials with large Seebeck ...

Nature Research2020

Regulating the anomalous Hall and Nernst effects in Heusler-based trilayers

Jean-Philippe Ansermet, Simon Granville, Haiming Yu, Song Liu, Sa Tu, Junfeng Hu

Anomalous Hall and anomalous Nernst properties of thin MgO/Co-2Fe0.4Mn0.6Si/Pd stacks with perpendicular magnetic anisotropy (PMA) revealed the presence of the magnetic proximity effect (MPE) in the Pd layer. The MPE is evidenced by nanometer range thickne ...

2020

Anomalous Nernst effect in Co2MnGa thin films with perpendicular magnetic anisotropy

Jean-Philippe Ansermet, Simon Granville, Haiming Yu, Song Liu, Sa Tu, Junfeng Hu, Yao Zhang

The thermoelectric and transport properties of MgO/Co2MnGa/Pd stacks with perpendicular magnetic anisotropy were measured. For a nominal 3.3 nm Co2MnGa thickness, the anomalous Nernst coefficient and the Nernst angle at room temperature were found to be 0. ...

ELSEVIER2020

Spin-Dependent Thermoelectric Transport in Cobalt-Based Heusler Alloys

Simon Granville, Haiming Yu, Junfeng Hu

Sitting at the intersection of spintronics and thermoelectricity, research investigating the coupling of thermoelectric, magnetic, and electrical transport properties in materials has recently found that the ferromagnetic Heusler alloys are the ideal testb ...

WILEY-V C H VERLAG GMBH2020

Doping effect on the thermoelectric transport properties of HfTe5

Jean-Philippe Ansermet, Haiming Yu, Junfeng Hu

We studied the influence of doping HfTe5 with 5% Ti on electric (resistivity and the Hall effect) and thermoelectric transport properties (the Seebeck coefficient, magneto-thermoelectric power, and Nernst effect). The properties of 5% Ti-doped HfTe5 do not ...

2019

Large magnetothermopower and anomalous Nernst effect in HfTe5

Jean-Philippe Ansermet, Helmuth Berger, Arnaud Magrez, Haiming Yu, Jan Hugo Dil, Edoardo Martino, Sa Tu, Marco Caputo, Junfeng Hu

Topological quantum materials have stimulated growing attention because they reveal novel aspects of condensed matter physics and point to new opportunities in materials science, in particular for thermoelectrics. Here, we experimentally study thermoelectr ...

AMER PHYSICAL SOC2019

Anomalous Hall and Nernst Effects in Co2TiSn and Co2Ti0.6V0.4Sn Heusler Thin Films

Jean-Philippe Ansermet, Haiming Yu, Sa Tu, Junfeng Hu, Yao Zhang

Magnetotransport (magnetoresistance and anomalous Hall effect) and thermoelectric (Seebeck and anomalous Nernst effect) effects are investigated on epitaxially grown Co2TiSn and Co2Ti0.6V0.4Sn Heusler thin films. An anomalous Nernst coefficient up to 1.8 m ...

American Physical Society (APS)2018

Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy (vol 111, 222401, 2017)

Jean-Philippe Ansermet, Haiming Yu, Xiangrong Wang, Sa Tu, Junfeng Hu, Jianyu Zhang, Yao Zhang

AMER INST PHYSICS2018

Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy

Jean-Philippe Ansermet, Haiming Yu, Xiangrong Wang, Sa Tu, Junfeng Hu, Jianyu Zhang, Yao Zhang

The anomalous Nernst effect in a perpendicularly magnetized Ir22Mn78/Co20Fe60B20/MgO thin film is measured using well-defined in-plane temperature gradients. The anomalous Nernst coefficient reaches 1.8 mu V/K at room temperature, which is almost 50 times ...

American Institute of Physics2017