Spin beats and magnetic dynamics in II-VI quantum structures

J. J. Baumberg, S. A. Crooker, D. D. Awschalom, Nitin Samarth

Research output: Contribution to journalArticle

Abstract

We use a novel optical probe of magnetization to explore the evolution of carrier spin scattering and magnetic dynamics in quantum-confined geometries. II-VI magnetic heterostructures are studied using femtosecond Faraday rotation and exhibit both carrier phase- (approx. 1 ps) and spin-scattering (approx. 6 ps) in concert with a field-tunable terahertz quantum-beating of the total carrier spin. Spin-flip processes experienced by photoexcited carriers as they tunnel through nanometer-thick magnetic barriers produce a magnetic perturbation strongly sensitive to the initial magnetic state and the spin-orientation of the pumped carriers. Once these carriers have recombined (approx. 70 ps), the magnetic ions relax through completely different channels of significantly slower decay rate (100 ps - 10 ns). The relaxation characteristics are found to be substantially influenced by exchange coupling between adjacent magnetic ions at low temperatures (T < 13 K). These low-dimensional magnetic systems yield a rich array of spin phenomena untapped in traditional semiconductor heterostructures.

Original languageEnglish (US)
Pages (from-to)429-434
Number of pages6
JournalMaterials Science Forum
Volume182-184
StatePublished - 1995

Fingerprint

Heterojunctions
synchronism
Scattering
Ions
Faraday effect
Exchange coupling
Magnetization
Tunnels
Semiconductor materials
Geometry
scattering
Temperature
decay rates
tunnels
ions
perturbation
magnetization
probes
geometry

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Baumberg, J. J., Crooker, S. A., Awschalom, D. D., & Samarth, N. (1995). Spin beats and magnetic dynamics in II-VI quantum structures. Materials Science Forum, 182-184, 429-434.
Baumberg, J. J. ; Crooker, S. A. ; Awschalom, D. D. ; Samarth, Nitin. / Spin beats and magnetic dynamics in II-VI quantum structures. In: Materials Science Forum. 1995 ; Vol. 182-184. pp. 429-434.
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Baumberg, JJ, Crooker, SA, Awschalom, DD & Samarth, N 1995, 'Spin beats and magnetic dynamics in II-VI quantum structures', Materials Science Forum, vol. 182-184, pp. 429-434.

Spin beats and magnetic dynamics in II-VI quantum structures. / Baumberg, J. J.; Crooker, S. A.; Awschalom, D. D.; Samarth, Nitin.

In: Materials Science Forum, Vol. 182-184, 1995, p. 429-434.

Research output: Contribution to journalArticle

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AU - Crooker, S. A.

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AB - We use a novel optical probe of magnetization to explore the evolution of carrier spin scattering and magnetic dynamics in quantum-confined geometries. II-VI magnetic heterostructures are studied using femtosecond Faraday rotation and exhibit both carrier phase- (approx. 1 ps) and spin-scattering (approx. 6 ps) in concert with a field-tunable terahertz quantum-beating of the total carrier spin. Spin-flip processes experienced by photoexcited carriers as they tunnel through nanometer-thick magnetic barriers produce a magnetic perturbation strongly sensitive to the initial magnetic state and the spin-orientation of the pumped carriers. Once these carriers have recombined (approx. 70 ps), the magnetic ions relax through completely different channels of significantly slower decay rate (100 ps - 10 ns). The relaxation characteristics are found to be substantially influenced by exchange coupling between adjacent magnetic ions at low temperatures (T < 13 K). These low-dimensional magnetic systems yield a rich array of spin phenomena untapped in traditional semiconductor heterostructures.

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Baumberg JJ, Crooker SA, Awschalom DD, Samarth N. Spin beats and magnetic dynamics in II-VI quantum structures. Materials Science Forum. 1995;182-184:429-434.