Anomalous hall effect in Gd-implanted wurtzite AlxGa t-xN/GaN high electron mobility transistor structures

Fang Yuh Lo, Alexander Melnikov, Dirk Reuter, Yvon Cordier, Andreas D. Wieck

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

AlxGa1-xN/GaN high electron mobility transistor (HEMT) structures grown by ammonia-source molecular beam epitaxy (MBE) are focused-ion-beam implanted with 300 keV Gd-ions at room temperature. The two-dimensional electron gas (2DEG) of these HEMT structures is located 27 nm underneath the sample surface. At 4.2 K, current-voltage characteristics across implanted rectangles show that the structures remain conducting up to a Gd-dose of 1×1012 cm-2. Anomalous Hall effect (AHE) is observed at T = 4.2 K for structures implanted with Gd, whose dose is 3×1011 cm-2. Measurements of AHE in the wide temperature range from 2.4 K to 300 K show that the magnetic ordering temperature of these structures is around 100 K. Therefore, these Gd-implanted HEMT structures containing the still conducting 2DEG. which is now embedded in a ferromagnetic semiconductor, open the possibility to polarize the electron spins.

Original languageEnglish
Pages (from-to)61-69
Number of pages9
JournalMaterials Research Society Symposium Proceedings
Volume1111
Publication statusPublished - 2009 Nov 26
Event2008 MRS Fall Meeting - Boston, MA, United States
Duration: 2008 Dec 12008 Dec 4

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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