TY - JOUR

T1 - Stimulated spin noise in an activated crystal

AU - Sharipova, M.M.

AU - Kamenskii, A.A.

AU - Ryzhov, I.I.

AU - Petrov, M.Yu.

AU - Kozlov, G.G.

AU - Greilich, A.

AU - Bayer, M.

AU - Zapasskii, V.S.

PY - 2019/10/14

Y1 - 2019/10/14

N2 - In the spin noise spectroscopy, the magnetic susceptibility spectrum is known to be provided by the spinsystem untouched by any external perturbation, or, better to say, disturbed only by its thermal bath. We propose a new version of the spin noise spectroscopy, with the detected magnetization (Faraday-rotation)noise being stimulated by an external fluctuating magnetic field with a quasi-white spectrum. Experimental study of the stimulated spin noise performed on a BaF2 : U 3+ crystal in a longitudinal magnetic field has revealed specific features of this approach and allowed us to identify the Van-Vleck and population-related contributions to the AC susceptibility of the system and to discover unusual magnetic-field dependence of the longitudinal spin relaxation rate in low magnetic fields. It is shown that spectra of the stimulated and spontaneous spin noise, being both closely related to the spin-system magnetic susceptibility, are still essentially different. Distinctions between the two types of the spin-noise spectra and two approaches to the spin noise spectroscopy are discussed.

AB - In the spin noise spectroscopy, the magnetic susceptibility spectrum is known to be provided by the spinsystem untouched by any external perturbation, or, better to say, disturbed only by its thermal bath. We propose a new version of the spin noise spectroscopy, with the detected magnetization (Faraday-rotation)noise being stimulated by an external fluctuating magnetic field with a quasi-white spectrum. Experimental study of the stimulated spin noise performed on a BaF2 : U 3+ crystal in a longitudinal magnetic field has revealed specific features of this approach and allowed us to identify the Van-Vleck and population-related contributions to the AC susceptibility of the system and to discover unusual magnetic-field dependence of the longitudinal spin relaxation rate in low magnetic fields. It is shown that spectra of the stimulated and spontaneous spin noise, being both closely related to the spin-system magnetic susceptibility, are still essentially different. Distinctions between the two types of the spin-noise spectra and two approaches to the spin noise spectroscopy are discussed.

KW - Stochastic processes

KW - Spin noise spectroscopy

KW - Spectrum analyzers

KW - Electronic noise

KW - Electronic transport

KW - Hyperfine structure

KW - Nuclear magnetic resonance

KW - Faraday effect

KW - magnetic fields

KW - AC SUSCEPTIBILITY

KW - MAGNETOOPTICAL METHOD

KW - SPECTROSCOPY

KW - ELECTRON-PARAMAGNETIC-RESONANCE

UR - https://aip.scitation.org/doi/10.1063/1.5116901?ai=1gvoi&mi=3ricys&af=R&feed=most-recent

UR - http://www.scopus.com/inward/record.url?scp=85073254965&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/stimulated-spin-noise-activated-crystal

U2 - 10.1063/1.5116901

DO - 10.1063/1.5116901

M3 - Article

VL - 126

SP - 143901

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 14

M1 - 143901

ER -