Spontaneous spin-splitting observed in resonant tunneling diode with narrow band-gap asymmetric quantum well

Shooji Yamada, T. Kikutani, S. Gozu, Y. Sato, T. Kita

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5 Citations (Scopus)

Abstract

This paper deals with the experiments to observe the spontaneous spin-splitting (SSS) in the resonant tunneling diode (RTD), which was specially designed to have a narrow band gap as well as an asymmetric potential well. In current-voltage (I-V) characteristics, there observed a current peak doubly splitted (denoted as P1-1 and P1-2) at low bias field. The difference of the derivative peak height of P1-1 between those with and without the parallel magnetic field (dI/dV(B)-dI/dV(B = 0)), which was applied along the easy axis of the emitter electrode, increased with increasing field strength, while the quantity of P1-2 stayed almost zero. The increase of the difference of the derivative peak height of P1-1 was found to saturate almost at the coercive field of the electrode. It was also found that those variations of the derivative peak height were observed only in the case of electron injection via the ferromagnetic (NiFe) emitter electrode. The amount of splitting (∼15 meV) observed was almost the same as those estimated from magnetoresistance measurements. These results suggest that the observed splitted peak is intimately related to the SSS expected at the center well in our unique RTDs.

Original languageEnglish
Pages (from-to)815-818
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume13
Issue number2-4
DOIs
Publication statusPublished - 2002 Mar 1

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Keywords

  • I-V characteristics
  • Resonant tunneling diode
  • Spin injection
  • Spontaneous spin-splitting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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