Y_(3-x)Bi_xFe_5O_(12)系列单晶的磁振子劲度系数,散射强度及线宽的布里渊散射研究

Ｙ３－ｘＢｉｘＦｅ５Ｏ１２系列单晶的磁振子劲度系数，散射强度及线宽的布里渊散射研究萧季驹李泽民（香港城市大学物理及材料科学系香港九龙）刘玉龙朱恪张昊（中科院物理研究所北京１０００８０）ＢｒｉｌｏｕｉｎＳｃａｔｅｒｉｎｇＳｔｕｄｙｏｎＥｘｃｈａｎｇｅＳ...     

KH_2PO_4和（CH_3NHCH_2COOH）_3CaCl_2在高压下的状

在活塞圆筒式Ｐ～Ｖ关系测量装置上，研究了ＫＨ＿２ＰＯ＿４（ＫＤＰ）和（ＣＨ＿３ＮＨＣＨ＿２ＣＯ－ＯＨ）＿３ＣａＣＩ＿２［Ｔｒｉｓ－ｓａｒｃｏｓｉｎｅｃａｌｃｉｕｍｃｈｌｏｒｉｄｅ（ＴＳＣＣ）］在室温下、４．５ＧＰａ内的ｐ～Ｖ关系。实验结果表明：ＫＤＰ在２．１ＧＰａ左右有一个相变；ＴＳＣＣ在０．８ＧＰａ和３．２ＧＰａ左右各有一个相变。本工作还给出了它们在相变前后的状态方程，以及它们的格临爱森参数γＯ、体积模量Ｂ＿ｏ和Ｂ＿ｏ的压力导数Ｂ＿ｏ。     

Authors Index to Volume B5

ＡｕｔｈｏｒｓＩｎｄｅｘｔｏＶｏｌｕｍｅＢ５ＡＮＨｏｎｇｌｉｎ－－（６），５０１ＢＡＯＧｕｏｊＵｎ－－（ｌ），８ＢＡＯＪｉａｓｈａｎ－－（ｌ），４３ＣＡＩＢａｎｇｗｅｉ－－（４），３６３ＣＡＯａｃｉｎｇ－－（１），９４ＣＡＯＱｉｎｇ－－（５），４３９...     

粉末套管BPSCCO／Ag复合带载流各向异性特征的研究

本工作采用直流传输电流和直流磁化行为的测量研究了经恰当热－机制处理后的ＢＰＳＣＣＯ／Ａｇ复合带的临界电流特性，表明：由于ＢＰＳＣＣＯ晶粒的强ｃ轴择优取向，传输和磁化临界电流密度呈现大的各向异性，磁场在ｃ轴的分量起有主要作用，因传输和磁人监蚧电流密度相应于各向异性临界电流密度的不同主分量，故它们随角度变化的行为不同，传输电流的Ｉ－Ｖ曲线入磁驰豫Ｍ－ｔ曲线都呈现幂指数关系，即分别为Ｖ∝ＡＩ和Ｍ∝Ｂｔ，     

S9^11＋离子能级和振子强度

用组态相互作用程序ＣＩＶ３计算了Ｓｉ＾１１＋离子能级和振子强度。在计算中，考虑了一个电子保持在Ｉｓ轨道上，其余两个电子各种布居组态的组态相互作用。这种方法大大地改善了振子强度的计算结果。     

作者索引

Ｃｕｍｕｌａｔｉｖｅ Ａｕｔｈｏｒ Ｉｎｄｅｘ ｆｏｒ Ｖｏｌ．２２,Ｎｏ．１～４ ａｎｄ Ｓｕｐｐ．ＡＮ Ｙｕｙｉｎｇ（安毓英）ｐ．１４３Ａｒａｋａｗａ Ｙ Ｓｕｐｐ．５７,６１,６７ＢＡＥ ＨｙｕｎｓｏｏＫ（裴贤淑）ｐ．５５ＢＡＯ Ｘｉｍａｏ（鲍希茂）ｐ．３３９ＢＡＮ Ｓｈｉｌｉａｎｇ（班士良）ｐ．３３Ｂｅｎｔｈａｍ Ｆ Ｃ Ｓｕｐｐ． １０３ＢＩ Ｚｈａｏｒｏｎｇ（毕朝荣）Ｓｕｐｐ．５７ＣＡＩ　Ｓｈｕｈｕｉ（蔡淑惠）ｐ．１７２,１８２ＣＡＩ Ｗｅｉｙｉｎｇ（蔡炜颖）　ｐ．１０７,１６１Ｃａｏ Ｌｉｘｉｎ（曹…     

Author Index to Volume B3, 1994

ＡｕｔｈｏｒＩｎｄｅｘｔｏＶｏｌｕｍｅＢ３，１９９４Ａｌｄａ，Ｊ．－－（３），２６５ＧｕｏＨｏｎｇ－－（２），１２９，１３７；（４），３１７；（５），４２１；Ｂｅｒｎａｂｅｕ，Ｅ．－－（３），２６５（６），５２９，５３３ＣａｔＳｈａｎｇｄａ－－（４）...     

GIANT MAGNETO-IMPEDANCE IN Fe-BASED SOFT FERROMAGNETIC RIBBONS

ＧＩＡＮＴＭＡＧＮＥＴＯ－ＩＭＰＥＤＡＮＣＥＩＮＦｅ－ＢＡＳＥＤＳＯＦＴＦＥＲＲＯＭＡＧＮＥＴＩＣＲＩＢＢＯＮＳＣｈｅｎＣｈｅｎＭｅｉＬｉａｎｇｍｏＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＳｈａｎｄｏｎｇＵｎｉｖｅｒｓｉｔｙ，Ｊｉｎａｎ２５０１００...     

FT—IR,UV／VIS,Raman光谱法研究血红蛋白和银,铜离子的作用

本文报导血红蛋白（Ｈｂ）同银（Ｉ）－铜（Ⅱ）离子的作用，研究表明，在ｐＨ１０．５的Ｂ４Ｏ＾－２７－ＯＨ＾－缓冲介质中，当有十二烷基硫酸钠（ＳＤＳ）和甲醛存在时，Ｈｂ－Ａｇ－Ｃｕ物种表出强的橙黄色，用ＦＴ－ＩＲ，ＵＶ／ＶＩＳ和振动Ｒａｍａｎ光谱研究Ｈｂ－Ａｇ－Ｃｕ物种的形成机理，表明血红蛋白中氨基酸残基上的氮和氧与银－铜离子有较强的作用，用Ｈｂ中氨基的修饰证明这一机理。     

A STATISTICAL THEORY FOR THE BIO-PHOTON EMISSION OF THE LIVING SYSTEMS

ＡＳＴＡＴＩＳＴＩＣＡＬＴＨＥＯＲＹＦＯＲＴＨＥＢＩＯ－ＰＨＯＴＯＮＥＭＩＳＳＩＯＮＯＦＴＨＥＬＩＶＩＮＧＳＹＳＴＥＭＳＰａｎｇＸｉａｏｆｅｎｇＩｎｔｅｒｎａｔｉｏｎａｌＣｅｎｔｒｅｆｏｒＭａｔｅｒｉａｌＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃａＤ...     

用于光纤电流传感器的掺Bi稀土铁石榴石单晶生长与磁光性能

用熔盐法生长了两种Bi替代的高法拉第旋转、温度稳定的稀土铁石榴石磁光单晶Bi-HoYbIG和Bi-GdYIG,测试分析了其在近红外波段的磁光性能及其温度特性。Ho3-z-y,YbyiBixFe512(x＝1.03,y=1.20)单晶的比法拉第旋转角为-891°/cm(λ=1.31μm)和-767°/cm(λ＝1.55μm),Y3-z-yGdyBixFe5O12(x=0.46,y=0.24)单晶的值为－1067°／cm(λ=1.31μm)和-882°／cm(λ=1.55μm),两者都比纯YIG晶体高出许多。而且这两种晶体的法拉第旋转角随温度变化较小,在250～400K范围内,其温度灵敏度S分别为4. 60×10-4／K和4. 20×10-4/K。分析表明,Bi的掺入能大大提高晶体的法拉第旋转角,而yb3+、Gd3+等离子的掺入可以有效降低Bi3+替代磁光单晶的法拉第旋转的温度灵敏性,Bi-HoYbiG和Bi-GdYIG等磁光晶体非常适合作为高灵敏度、温度稳定的光纤电流传感器中的法拉第转子材料。     

Brillouin-Mandelstam scattering from thermal and excited magnons

Brillouin-Mandelstam scattering (BMS) is the scattering of light from acoustical quasiparticles (phonons, magnons and others). The frequency shift under BMS is 10–100 GHz. The observation of BMS from magnons became possible only after J. Sandercock had designed a multi-pass Fabry-Perot interferometer with a high contrast (1971). BMS from magnons has, by now, been observed in CrBr₃ (Sandercock), YIG, FeBO₃ (Jantz, Sandercock, Wettling), CoCO₃ (Borovik-Romanov, Jotikov, Kreines), EuO, EuS (Grünberg, Metawe), Ni, Fe (Sandercock, Wettling), metglasses (Chang, Malozemoff, Grimsditch, Senn, Winterling). In this review the main results of the above works are presented.The dispersion laws of magnons were studied by BMS in the energy range (inaccessible for neutron diffraction) where the contributions due to three types of interaction: magnetic, dipole-dipole, and exchange can be separated.Investigation of BMS in EuO and metals has led to the discovery of surface magnons. BMS from standing spin waves has been observed in thin films of metglasses.By observing BMS, it is possible to study quasiparticles pumped by microwave power. It was found that under ferro- or antiferromagnetic resonance an excess of quasiparticles arises, these quasiparticles being magnons with the frequency equal to that of microwave power and phonons with half the microwave frequency. Scattering of light from parametrically excited magnons has also been observed. This opens new possibilities for studying relaxation processes in magnetic materials.     

Conversion electron Mössbauer spectroscopic study of YIG substituted with Bi,Ti, Ga and La

YIG films, substituted with Bi, Ti, Ga and La, were grown on a (111) plane of Gd₃Ga₅O₁₂ or (Gd, Ca)₃(Ga, Mg, Zr)₅O₁₂ by a liquid phase epitaxial method. With the increase of the concentration of Bi atoms, which are substituted at 24c sites of YIG, the magnetic hyperfine fields at 16a and 24d Fe sites increased and the direction of magnetic moments changed from parallel to 45° to the (111) plane. With the increase of Ga concentration, the hyperfine fields at 16a and 24d Fe sites decreased. The hyperfine interaction and the substitution effect of YIG films are discussed.     

Stationary Entanglement between Light and Microwave via Ferromagnetic Magnons

It is shown how to generate stationary entanglement between light and microwave in a hybrid opto-electro-magnonical system which mainly consists of a microwave cavity, a yttrium iron garnet (YIG) sphere, and a nanofiber. The optical modes in nanofiber can evanescently be coupled to whispering gallery modes, that are able to interact with magnon mode via spin–orbit interaction, in YIG sphere, while the microwave cavity photons and magnons are coupled through magnetic dipole interaction simultaneously. Under reasonable parameter regimes, pretty amount of entanglement can be generated, and it also shows persistence against temperature. The present work is expected to provide a new perspective for building more advanced and comprehensive quantum networks along with magnons for fast-developing quantum technologies and for studying the macroscopic quantum phenomena.     

Temperature dependence of spin pumping in YIG/NiOx/W multilayer

We report the temperature dependence of the spin pumping effect for Y₃Fe₅O₁₂ (YIG, 0.9 μm)/NiO (t_NiO)/W (6 nm) (t_NiO = 0 nm, 1 nm, 2 nm, and 10 nm) heterostructures. All samples exhibit a strong temperature-dependent inverse spin Hall effect (ISHE) signal I_c and sensitivity to the NiO layer thickness. We observe a dramatic decrease of I_c with inserting thin NiO layer between YIG and W layers indicating that the inserting of NiO layer significantly suppresses the spin transport from YIG to W. In contrast to the noticeable enhancement in YIG/NiO (t_NiO ≈ 1-2 nm)/Pt, the suppression of spin transport may be closely related to the specific interface-dependent spin scattering, spin memory loss, and spin conductance at the NiO/W interface. Besides, the I_c of YIG/NiO/W exhibits a maximum near the T_N of the AF NiO layer because the spins are transported dominantly by incoherent thermal magnons.     

The origin of spin current in YIG/nonmagnetic metal multilayers at ferromagnetic resonance

Spin pumping in yttrium-iron-garnet(YIG)/nonmagnetic-metal(NM) layer systems under ferromagnetic resonance(FMR) conditions is a popular method of generating spin current in the NM layer.A good understanding of the spin current source is essential in extracting spin Hall angle of the NM and in potential spintronics applications.It is widely believed that spin current is pumped from precessing YIG magnetization into NM layer.Here,by combining microwave absorption and DC-voltage measurements on thin YIG/Pt and YIG/NM_1/NM_2(NM_1 =Cu or Al,NM_2 =Pt or Ta),we unambiguously showed that spin current in NM,instead of from the precessing YIG magnetization,came from the magnetized NM surface(in contact with thin YIG),either due to the magnetic proximity effect(MPE) or from the inevitable diffused Fe ions from YIG to NM.This conclusion is reached through analyzing the FMR microwave absorption peaks with the DC-voltage peak from the inverse spin Hall effect(ISHE).The voltage signal is attributed to the magnetized NM surface,hardly observed in the conventional FMR experiments,and was greatly amplified when the electrical detection circuit was switched on.     

Large enhancement of Faraday rotation by localized surface plasmon resonance in Au nanoparticles embedded in Bi:YIG film

A large enhancement of the Faraday rotation, which is associated with localized surface plasmon resonance (LSPR), was obtained in a sample with Au nanoparticles embedded in a Bi-substituted yttrium iron garnet (Bi:YIG) film. On a quartz substrate, Au nanoparticles were formed by heating an Au thin film, and a Bi:YIG film was then deposited on them. A sample containing the Au nanoparticles produced by 1000 °C heating showed a resonant attenuation with narrower bandwidth in the transmission spectrum than nanoparticles of other samples formed by low-temperature heating. The sharp resonant Faraday rotation angle was 4.4 times larger than the estimated intrinsic Bi:YIG film at the LSPR wavelength; the angular difference was 0.14°. A discrepancy in the bandwidth between the transmission attenuation and the resonant Faraday rotation is discussed.     

The doping effects of BiFe_1-xCo_xO₃（x=0.0-0.8） in layered perovskite Bi₄Ti₃O₁₂ ceramics

Bi5Fe1-xCoxTi3O15(x = 0.0, 0.2, 0.4, 0.5, 0.6, and 0.8) multiferroic ceramics are synthesized in two steps using the solid state reaction technique. X-ray diffraction patterns show that the samples have four-layer Aurivillius phases. At room temperature (RT), the samples each present a remarkable coexistence of ferromagnetism (FM) and ferroelectricity (FE). The remnant polarization (2P r ) reaches its greatest value of 14 μC/cm 2 at x = 0.6. Remnant magnetization (2M r ) first increases and then decreases, and the greatest 2M r is 7.8 menu/g when x = 0.5. The magnetic properties for x = 0.4 are similar to those for x = 0.6, indicating that the magnetic properties originate mainly from the coupling between Fe 3+ and Co 3+ ions, rather than from their own magnetic moments.     

Spin pumping at the magnetic insulator (YIG)/normal metal (Au) interfaces

Spin injection across the ferrimagnetic insulator (YIG)/normal metal (Au) interface was studied by ferromagnetic resonance. The spin mixing conductance was determined by comparing the Gilbert damping in bare YIG films with those covered by a Au/Fe/Au structure. The Fe layer in Au/Fe/Au acted as a spin sink as displayed by an increased Gilbert damping parameter α compared to that in the bare YIG. In particular, for the 9.0 nm YIG/2.0 nm Au/4.3 nm Fe/6.1 nm Au structure, the YIG and Fe films were coupled by an interlayer exchange coupling, and the exchange coupled YIG exhibited an increased Gilbert damping compared to the bare YIG. This relationship between static and dynamic coupling provides direct evidence for spin pumping. The transfer of spin momentum across the YIG interface is surprisingly efficient with the spin mixing conductance g(↑↓) ? 1.2 × 10(14) cm(-2).