Time-Resolved Faraday Rotation Spectroscopy of Spin Dynamics in Digital Magnetic Heterostructures

Scott A. Crooker, David D. Awschalom, Nitin Samarth

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

A time-resolved resonant Faraday rotation spectroscopy is employed to study the dynamical interplay between local magnetic moments and photoexcited carrier spins in quantum-confined semiconductor geometries. This highly sensitive technique functions as an energy selective, noninvasive, all-optical probe of spin dynamics ranging from femtosecond to microsecond timescales and is particularly suited to low-dimensional systems having small numbers of magnetic spins. Carrier spin-scattering rates, lifetimes, and the orientation and relaxation of perturbed magnetic ions are directly observed in the time domain. The utility of this technique is demonstrated through the study of a newly developed class of magnetic heterostructure, in which fractional monolayer planes of magnetic Mn2+ ions are incorporated “digitally” into nonmagnetic II-VI ZnSe-ZnCdSe quantum wells. These digital magnetic heterostructures (DMH) possess large g-factors and exhibit enormous low-field resonant Faraday rotations in excess of 1.7 × 107 deg/T·cm at low temperatures. Time-resolved Faraday rotation measurements identify a wealth of unexpected electronic and magnetic spin dynamics that are different from those generated in traditional semiconductors or alloyed diluted magnetic semiconductor structures.

Original languageEnglish (US)
Pages (from-to)1082-1092
Number of pages11
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume1
Issue number4
DOIs
StatePublished - Dec 1995

Fingerprint

Spin dynamics
Faraday effect
spin dynamics
Heterojunctions
Spectroscopy
Semiconductor materials
spectroscopy
Ions
Magnetic moments
Semiconductor quantum wells
Monolayers
ions
magnetic moments
quantum wells
Scattering
life (durability)
Geometry
probes
geometry
scattering

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

@article{64dd3e63583044d8a1c9aa520f9e9782,
title = "Time-Resolved Faraday Rotation Spectroscopy of Spin Dynamics in Digital Magnetic Heterostructures",
abstract = "A time-resolved resonant Faraday rotation spectroscopy is employed to study the dynamical interplay between local magnetic moments and photoexcited carrier spins in quantum-confined semiconductor geometries. This highly sensitive technique functions as an energy selective, noninvasive, all-optical probe of spin dynamics ranging from femtosecond to microsecond timescales and is particularly suited to low-dimensional systems having small numbers of magnetic spins. Carrier spin-scattering rates, lifetimes, and the orientation and relaxation of perturbed magnetic ions are directly observed in the time domain. The utility of this technique is demonstrated through the study of a newly developed class of magnetic heterostructure, in which fractional monolayer planes of magnetic Mn2+ ions are incorporated “digitally” into nonmagnetic II-VI ZnSe-ZnCdSe quantum wells. These digital magnetic heterostructures (DMH) possess large g-factors and exhibit enormous low-field resonant Faraday rotations in excess of 1.7 × 107 deg/T·cm at low temperatures. Time-resolved Faraday rotation measurements identify a wealth of unexpected electronic and magnetic spin dynamics that are different from those generated in traditional semiconductors or alloyed diluted magnetic semiconductor structures.",
author = "Crooker, {Scott A.} and Awschalom, {David D.} and Nitin Samarth",
year = "1995",
month = "12",
doi = "10.1109/2944.488685",
language = "English (US)",
volume = "1",
pages = "1082--1092",
journal = "IEEE Journal on Selected Topics in Quantum Electronics",
issn = "1077-260X",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

Time-Resolved Faraday Rotation Spectroscopy of Spin Dynamics in Digital Magnetic Heterostructures. / Crooker, Scott A.; Awschalom, David D.; Samarth, Nitin.

In: IEEE Journal on Selected Topics in Quantum Electronics, Vol. 1, No. 4, 12.1995, p. 1082-1092.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Time-Resolved Faraday Rotation Spectroscopy of Spin Dynamics in Digital Magnetic Heterostructures

AU - Crooker, Scott A.

AU - Awschalom, David D.

AU - Samarth, Nitin

PY - 1995/12

Y1 - 1995/12

N2 - A time-resolved resonant Faraday rotation spectroscopy is employed to study the dynamical interplay between local magnetic moments and photoexcited carrier spins in quantum-confined semiconductor geometries. This highly sensitive technique functions as an energy selective, noninvasive, all-optical probe of spin dynamics ranging from femtosecond to microsecond timescales and is particularly suited to low-dimensional systems having small numbers of magnetic spins. Carrier spin-scattering rates, lifetimes, and the orientation and relaxation of perturbed magnetic ions are directly observed in the time domain. The utility of this technique is demonstrated through the study of a newly developed class of magnetic heterostructure, in which fractional monolayer planes of magnetic Mn2+ ions are incorporated “digitally” into nonmagnetic II-VI ZnSe-ZnCdSe quantum wells. These digital magnetic heterostructures (DMH) possess large g-factors and exhibit enormous low-field resonant Faraday rotations in excess of 1.7 × 107 deg/T·cm at low temperatures. Time-resolved Faraday rotation measurements identify a wealth of unexpected electronic and magnetic spin dynamics that are different from those generated in traditional semiconductors or alloyed diluted magnetic semiconductor structures.

AB - A time-resolved resonant Faraday rotation spectroscopy is employed to study the dynamical interplay between local magnetic moments and photoexcited carrier spins in quantum-confined semiconductor geometries. This highly sensitive technique functions as an energy selective, noninvasive, all-optical probe of spin dynamics ranging from femtosecond to microsecond timescales and is particularly suited to low-dimensional systems having small numbers of magnetic spins. Carrier spin-scattering rates, lifetimes, and the orientation and relaxation of perturbed magnetic ions are directly observed in the time domain. The utility of this technique is demonstrated through the study of a newly developed class of magnetic heterostructure, in which fractional monolayer planes of magnetic Mn2+ ions are incorporated “digitally” into nonmagnetic II-VI ZnSe-ZnCdSe quantum wells. These digital magnetic heterostructures (DMH) possess large g-factors and exhibit enormous low-field resonant Faraday rotations in excess of 1.7 × 107 deg/T·cm at low temperatures. Time-resolved Faraday rotation measurements identify a wealth of unexpected electronic and magnetic spin dynamics that are different from those generated in traditional semiconductors or alloyed diluted magnetic semiconductor structures.

UR - http://www.scopus.com/inward/record.url?scp=0029533439&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029533439&partnerID=8YFLogxK

U2 - 10.1109/2944.488685

DO - 10.1109/2944.488685

M3 - Article

AN - SCOPUS:0029533439

VL - 1

SP - 1082

EP - 1092

JO - IEEE Journal on Selected Topics in Quantum Electronics

JF - IEEE Journal on Selected Topics in Quantum Electronics

SN - 1077-260X

IS - 4

ER -