The relationship between magnetism and magneto-optical effects in rare earth doped aluminophosphate glasses

Văleanu, M.; Sofronie, M.; Gâlcă, A.C.; Ţolea, Felicia; Elisa, M.; Sava, Bogdan Alexandru; Boroica, Lucica; Kuncser, V.

doi:10.1088/0022-3727/49/7/075001

Cited by 24 publications

(12 citation statements)

References 28 publications

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“…The Faraday angle (rotation of the polarization plane under an applied field of induction B) was calculated using Equation (8) [ 9 ]:

where,

is the ellipsometric angle measured with the applied magnetic field (+0.2 T) and

is the ellipsometric angle without an applied magnetic field. Faraday ellipticity would be the difference between ellipsometric parameters Δ (the phase difference), recorded with and without the magnetic field.…”

Section: Resultsmentioning

confidence: 99%

“…It is worth mentioning the previous results of the authors related to magnetic and magneto-optical properties of Dy 3+ /Tb 3+ /La 3+ alumina-phosphate vitreous systems applied as bulk Faraday rotators [ 9 , 10 , 11 ] as well as to the rare-earth-doped silico-phosphate sol–gel thin films for magneto-optical applications [ 12 ]. A very recent work of the authors also referred to thermal, structural, mechanical, magnetic and magneto-optical properties of Bi 2 O 3 and PbO-doped boron-phosphate glasses [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

et al. 2020

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This work investigates the structural, magnetic and magneto-optical properties of a new zinc phosphate-tellurite glass belonging to the 45ZnO-10Al2O3-40P2O5-5TeO2 system. The glass was prepared by a wet method of processing the starting reagents followed by suitable melting–stirring–quenching–annealing steps. Specific parameters such as density, average molecular mass, molar volume, oxygen packaging density, refractive index, molar refractivity, electronic polarizability, reflection loss, optical transmission, band gap and optical basicity have been reported together with thermal, magnetic and magneto-optical characteristics. Absorption bands appear in the blue and red visible region, while over 600 nm the glass becomes more transparent. FTIR and Raman spectra evidenced phosphate-tellurite vibration modes proving the P2O5 and TeO2 network forming role. Magnetic measurements reveal the diamagnetic character of the Te-doped glass with an additional weak ferromagnetic signal, specific to diluted ferromagnetic oxides. Positive Faraday rotation angle with monotonous decreasing value at increasing wavelength was evidenced from magneto-optical measurements. The final product is a composite material comprising of a non-crystalline vitreous phase and Te-based nanoclusters accompanied by oxygen vacancies. The metallic-like Te colloids are responsible for the dark reddish color of the glass whereas the accompanying oxygen vacancies might be responsible for the weak ferromagnetic signal persisting up to room temperature.

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“…The Faraday angle (rotation of the polarization plane under an applied field of induction B) was calculated using Equation (8) [ 9 ]:

where,

is the ellipsometric angle measured with the applied magnetic field (+0.2 T) and

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

et al. 2020

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“…The Faraday angle (rotation of the polarization plane under an applied field of induction B (Figure 6A) was calculated using the Equation : 46

θ_{normalF} = (ψ_{B +} - ψ_{B = 0}),

where

ψ_{normalB +}

is the ellipsometric angle measured with the applied magnetic field (+0.2 T) and

ψ_{normalB = 0}

is the ellipsometric angle without an applied magnetic field.…”

Section: Resultsmentioning

confidence: 99%

“…Verdet constant is calculated using Equation : 46,47

θ_{normalF} = V B d,

where θ F is directly proportional with the applied magnetic field, B , the geometrical path of the light through the glass (eg, the glass thickness), d, and a proportional constant, V , named Verdet constant that is a specific for each material. Verdet constant in dependence on visible wavelength is presented in Figure 6B.…”

Section: Resultsmentioning

confidence: 99%

“…The obtained value of 7 × 10 −5 μ B/molecule is more than two order of magnitude lower than the magnetic moment of a paramagnetic center dispersed in a molecule showing that in fact the ferromagnetic component has to be negligible in respect to the magneto‐optic effects which will be discussed in the following. To note that the paramagnetic susceptibility is lower than the diamagnetic one even at low temperature (eg 10 K), showing that at room temperature the magneto‐optical rotational effect (proportional to the magnetic susceptibility 46 is due mainly to the diamagnetic component. Concerning the physical interpretation for a paramagnetic center, it is to note that expectedly that magnetic carriers can be considered as most probable the Te ions (or TeO 2 group) and taking into account the molar composition of the titanium phosphate‐tellurite glass, a magnetic moment of 0.24 μ B per TeO 2 group (or Te ion) can be estimated.…”

Section: Discussionmentioning

confidence: 99%

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Synthesis and characterization of a titanium phosphate‐tellurite glass for Faraday rotators

et al. 2020

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This work is focused on investigation of thermal, structural, optical, magnetic, and magneto‐optical properties of novel titanium phosphate‐tellurite glass applied as Faraday rotators. The glass belonging to the system 35Li2O–10Al2O3–5TiO2–45P2O5–5TeO2 was prepared by a nonconventional wet route of raw materials processing, followed by melting‐quenching‐annealing steps. Some important physical properties of the investigated glass have been measured and calculated, providing knowledge related to glass compactness, electronic structure, glass forming capability, etc. XRD analysis evidenced an amorphous network structure of the investigated glass. The optical absorption in the Vis domain is mainly due to Ti3+ ions and Te2 clusters formed during the glass melting process. A relatively low optical absorption is noticed over 600 nm that activates a significant Faraday magneto‐optical effect. Photoluminescence bands in the blue, red, and infrared domains are observed, caused by Te2 clusters formed during the glass melting process. The magnetization in dependency on applied magnetic field reveals a complex behavior of the glass, depending on temperature. Thus, it is found a ferromagnetic behavior up to 2000 Oe, a paramagnetic component up to 40 000 Oe, followed by a diamagnetic one over 40 000 Oe. Faraday rotation angle and Verdet constant values in the visible domain are correlated with the reduced TeO2 content of the glass.

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Mechanical Manipulation of a Fiber‐Optical Microprobe Fabricated from Oxide Glasses with Magnetic Force Response

Ding

Tanaka

Wondraczek

2021

Advanced Photonics Research

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Oxide glasses incorporating large amounts of paramagnetic ion species are well known to exhibit magnetic functionality: through the specific choice of ion, such glasses may simultaneously exhibit magnetic force response and high or low magneto‐optical performance, adapted to target applications as optically active or passive component, respectively. Herein, glasses based on heavy doping of manganese, terbium, or thulium into aluminosilicate matrices are considered for magnetic force manipulation. Optical fiber fabricated from such glasses can be used as a magnetoresponsive probe, where an external magnetic field is used for precise, noncontact positioning, and distance manipulation at nanometer resolution. The ability to independently tailor force response and Faraday rotation efficiency enables a very broad range of applications, from active magnetic field sensing, optical switching and modulation to passive light delivery, near‐field optical sensing, force sensing, and mechanical manipulation.

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The relationship between magnetism and magneto-optical effects in rare earth doped aluminophosphate glasses

Cited by 24 publications

References 28 publications

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

Synthesis and characterization of a titanium phosphate‐tellurite glass for Faraday rotators

Mechanical Manipulation of a Fiber‐Optical Microprobe Fabricated from Oxide Glasses with Magnetic Force Response

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