Comparison of spin signals between 3T Hanle and 4T non-local methods for Co2Fe(Al,Si)/n-GaAs junctions

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Abstract

We investigated spin signals for Co2Fe(Al,Si)/n-GaAs Shottoky tunnel junctions by three terminal (3T) Hanle and four terminal (4T) non-local measurements. The ordering structure and magnetic moment increased with TCFAS up to 300 °C. The spin signals for Co2Fe(Al,Si)/n-GaAs Shottky tunnel junctions were clearly observed and these were also affected by TCFAS however, the TCFAS dependency was different obtained from 3T Hanle and 4T non-local measurements. The spin signals in 3T Hanle measurement decreases with increasing TCFAS up to 300 °C and increase for the sample with TCFAS= 400) °C. On the other hand, the spin signals in 4T non-local measurement increases with TCFAS up to 300 °C and decreases for the sample with TCFAS= 400) °C. This result obtained from 4T non-local measurement could be explained by the spin polarization of Co2Fe(Al,Si), and that from 3T Hanle measurement would not come from the spin polarization of Co2Fe(Al,Si) but other source, such as localized state around the interface between Co2Fe(Al,Si) and n-GaAs.

Original languageEnglish
Article number6971448
JournalIEEE Transactions on Magnetics
Volume50
Issue number11
DOIs
Publication statusPublished - 2014 Nov 1

Keywords

  • Hanle effect
  • Heusler alloys
  • non-local measurement
  • spin injection
  • spin polarization
  • spin signal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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