Ellipsometry and magnetooptical Kerr effect study of nanocrystalline zinc ferrite thin films

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI:10.1109/ICSPCOM.2015.7150657

P. Siroký, J. Pistora, S. C. Sahoo, E. Lišková-Jakubisová, Š. Višňovský, S. Prasad, D. Hrabovský, M. Bohra

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Abstract

Laser ablated zinc ferrite (ZnFe₂O₄) films deposited at O₂ pressure of 0.16 mbar onto fused quartz substrates are nanocrystalline and display net magnetic moment dependent on the substrate temperature (T_s) during deposition. At T_s = 350 °C, the room 4πM_s reached the maximum of 3 kG. The films were studied by spectral ellipsometry and magnetooptical (MO) Kerr effect spectroscopy at photon energies between 1 and 5 eV at room temperature in the longitudinal magnetic flux density 1.14 T. The optical and MO spectra show structural details typical for inverted spinels. Our ZnFe₂O₄ samples display amplitudes somewhat reduced with respect to those in other ferrimagnetic oxides with the exchange coupled Fe³⁺ pairs, i.e., in Li_0.5Fe_2.5O₄ and MgFe₂O₄ spinel ferrite and magnetoplumbite, PbFe₁₂O₁₉. The lower amplitudes are probably due to the interplay of nanocrystalline nature and lower degree of spinel inversion in the ZnFe₂O₄ laser ablated films.

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纳米晶铁氧体锌薄膜的椭偏和磁光克尔效应研究

激光烧蚀铁氧体锌(ZnFe2O4)薄膜在0.16 mbar的O2压力下沉积在熔融石英衬底上，薄膜呈纳米晶状，并显示出与衬底温度(Ts)相关的净磁矩。在Ts = 350℃时，房间4πMs达到最大值3kg。在纵向磁通密度为1.14 t、光子能量为1 ~ 5 eV的室温条件下，利用椭圆偏振光谱和磁光克尔效应光谱对薄膜进行了研究，光学光谱和磁光克尔效应光谱显示了倒立尖晶石的典型结构细节。我们的ZnFe2O4样品的振幅与其他具有交换耦合Fe3+对的铁磁性氧化物(即Li0.5Fe2.5O4和MgFe2O4尖晶石铁氧体和磁铅石PbFe12O19)相比有所降低。较低的振幅可能是由于ZnFe2O4激光烧蚀膜的纳米晶性质和较低的尖晶石反转程度的相互作用。

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2015 International Conference on Signal Processing and Communication (ICSC)

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