Femtosecond near-field spin microscopy in digital magnetic heterostructures (invited)

J. Levy, V. Nikitin, J. M. Kikkawa, D. D. Awschalom, N. Samarth

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


We have designed a low-temperature femtosecond-resolved near-field scanning optical microscope to study spatiotemporal excitonic spin behavior in magnetic semiconductor heterostructures. Local disorder introduced by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependent energy landscape for diffusing carriers. Near-field polarization-resolved static and femtosecond measurements map out excitonic spin behavior with ∼125 nm spatial resolution, revealing spin-dependent diffusion. We demonstrate the applicability of two distinct time-resolved techniques in the near field, and discuss limitations on the measurement of polarized luminescence from semiconductors in the near field.

Original languageEnglish (US)
Pages (from-to)6095-6100
Number of pages6
JournalJournal of Applied Physics
Issue number8 PART 2B
StatePublished - Apr 15 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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