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Journal of Rare Earths 2021年第8期39卷 1003-1009页

作者： Y.Slimani M.A.Almessiere A.Demir Korkmaz A.Baykal I.Ercan Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.0.Box 198231441 DammamSaudi Arabia Department of Chemistry Istanbul Medeniyet University34700 UskudarIstanbulTurkey Department of Nanomedicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia

In this comparative study,Tb and Tm substituted Sr-hexafe rrites(HFs) with the chemical compositions of SrTb_(x)Fe_(12-x)O_(19) and SrTm_(x)Fe_(12-x)O_(19)(x=0.00,0.02 and 0.04) were fabricated via citrate sol-gel *** ac susceptibility and FC-ZFC magnetization were *** product structure and morphologies were also investigated via XRD,TEM and SEM along with *** of temperature dependence of magnetization M-T and ac magnetic susceptibility versus temperature were carried *** various synthesized HFs displayed ferrimagnetic behavior within 10-325 *** lower temperatures,super-spin glass-like behavior was ***-Arrhenius and Vogel-Fulcher models were employed to explore the experimental data of ac susceptibility.

关键词： M-type hexaferrites Magnetic properties ac susceptibility FC/ZFC Rare earths

Effects of Fe doping on ac susceptibility of Pr_(0.75)Na_(0.25)MnO_3

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Chinese Physics B 2011年第11期20卷 487-492页

作者：李玉程倩戚大伟王继亮张晶王爽关晶 College of Science Northeast Forestry University Post-doctoral Mobile Research Station of Forestry Engineering Northeast Forestry University Material Science and Engineering College Northeast Forestry University

ac susceptibility at low temperatures of Pro.75Nao.25MnO3-xFexO3 （0 ≤ x ≤0.30） is investigated. The peak value of the real component of ac susceptibility X＇ at the freezing temperature Tf is suppressed with the increasing frequency. The peak value of X＇ shows a linear relation between Tf and the logarithm of the frequency ω. The normalized slope P = △Tf/Tf△lgco, which is much lower than canonical insulating spin glass systems in which 0.06 ≤ P ≤ 0,08. The peak value of the imaginary component of the ac susceptibility X＂ at Tf for the x= 0, 0.02, 0.30 samples increases with increasing frequency, suggesting a cluster glass ground state with a coexistence of charge-ordered phase and correlated ferromagnetic clusters in spin glass matrix. The peak value ofx＂ at Tf for the x = 0.10 sample decreases with increasing frequency, suggesting a phase separation ground state. The peak value of X＂at Tf for the x = 0.05 sample decreases with increasing frequency for ω ≤52 Hz and increases subsequently till 701 Hz, and then decreases with further increasing frequency for ω ≥ 1501 Hz. This complex behaviour is ascribed to the competition between the effects of large and little ferromagnetic clusters in the sample. The ground state of x = 0.05 sample is a transition state from cluster glass to phase separation.

关键词： magnetization ac susceptibility phase separation cluster-glass

MAGNETIC　RELAXATION　AT　EARLY　TIMES　AND　FLUX　DIFFUSION　BARRIER　V（J，B，T）　FOR　Ti－1223　DOPED　WITH　Pb　AND　Ba　BY　COMPLEX　ac　susceptibility　MEASUREMENTS

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南京大学学报(自然科学) 1995年第2期 185-186页

作者： Ding Shiying Wang Guoqiang Yao Xixian Pen Huotian Pen Qiuyun Zhou Sibal (Department of Physics and National Laboratory of Solid State Microstrnctures, Center for Advance Studies in Science and Technology of Microstructures, Naming University, 210093

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关键词： magnetic Relaxation ac susceptibility Tl1223 superconductor

Critical Scaling of Extended Power Law I - V Isotherms near Vortex Glass Transition

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Chinese Physics Letters 2006年第12期23卷 3349-3351页

作者：胡翔贺丽宁振华陈凯旋尹澜陆果徐晓林郭建栋王福仁李传义尹道乐 School of Physics Peking University Beijing 100871

In view of the question about the vortex glass theory of the freezing of disordered vortex matter raised by recent experimental observations, we reinvestigate the critical scaling of high Tc superconductors. It is found that the dc current-voltage characteristic of mixed state superconductors has a general form of extended power law which is based on the Ginzburg-Landau （GL） functional in the similar way as the vortex glass theory. Isotherms simulated from this nonlinear equation fit the experimental I- V data of Strachan et al. [Phys. Rev. Left. 87（2001） 067007]. The puzzling question of the derivative plot for the I - V curves and the controversy surrounding the values of critical exponents are discussed.

关键词： HIGH-TEMPERATURE SUPERCONDUCTORS T-C SUPERCONDUCTORS ac susceptibility VORTICES PHASE DISORDER

Role of Nd_2O_3 nanoparticles addition on microstructural and superconducting properties of YBa_2Cu_3O_(7–δ) ceramics

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Journal of Rare Earths 2016年第9期34卷 895-900页

作者： Aima Ramli Abdul Halim Shaari Hussein Baqiah Chen Soo Kean Mohd Mustafa Awang Kechik Zainal Abidin Talib Superconductivity and Thin Films Laboratory Department of Physics Universiti Putra Malaysia 43400 Serdang Selangor Malaysia Department of Physics School of Fundamental Science Universiti Malaysia Terengganu (UMT) 21030 Kuala Terengganu Terengganu Malaysia

The effects of Nd2O3 nanoparticles addition on microstructure, transport and ac susceptibility properties of YBa2Cu3O7–δ（Y123） superconductors were systematically investigated using X-ray diffraction （XRD）, scanning electron micrograph （SEM）, four point probe measurement and ac spectrometer. It was found that the added samples were predominant by Y-123 phase beside small amount of Y-211 and unreacted Nd2O3secondary phases. All added samples preserved the orthorhombic structure similar to the pure sample and no orthorhombic-to-tetragonal transition occurred. The samples became more porous and their grain size significantly de-creased with addition of Nd2O3. The addition of nano-Nd2O3 disturbed the grain growth of Y123, thus resulting in the degradation of superconducting properties of the samples. The superconducting transition temperature （Tc onset） of samples decreased from 92 K for x=0.0 to 78 K forx=1.0 wt.%, which could be attributable to oxygen vacancy disorder. From ac susceptibility result, the inter- and intra-granular loss peaks became wider and broader with increase of Nd2O3 addition due to the weakening of grains coupling. On the other hand, the inter-granular critical current density,Jcm, was found to increase with Nd2O3 addition and had the highest value at x=0.6, confirming that Nd2O3 nanoparticles acted as pinning centers in Y123 matrix.

关键词： YBCO critical temperature co-precipitation ac susceptibility critical current density rare earths

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

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Journal of Advanced Ceramics 2017年第3期6卷 251-261页

作者： V. SANDU E. CIMPOIASU A. KUNCSER M. S. NICOLESCU National Institute of Materials Physics Bucharest Magurele 077125 Romania Department of Physics US Naval Academy Annapolis MD USA National Institute of Materials Physics Bucharest Magurele 077125 RomaniaFaculty of Physics Bucharest University Bucharest-Magurele 077125 Romania

The specific dynamic magnetic response and magnetic relaxation phenomena in magnetite-based glass-ceramics by controlled crystallization of Fe-rich borosilicate glasses with 25 wt% Fe2O3, in the presence of two types of nucleating agents, Cr2O3 and P2O5, were investigated. The magnetic response is complex and shows contributions arising from two subsystems: a system with collective characteristics, superspin-glass like, and another one with single particle characteristics (superparamagnetic) with dipolar interaction. The nucleating agents have strong influence on the characteristic temperatures and anisotropy energy.

关键词： magnetite glass-ceramics ac susceptibility magnetic relaxation nucleating agent

Determination of the magnetic anisotropy constant of Cu/Fe/SiO_2/Si by a magneto-optical Kerr effect susceptometer

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Chinese Physics B 2014年第1期23卷 423-426页

作者：贾义娇何为叶军胡泊陈子瑜高有辉张向群杨海涛成昭华 State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Department of Physics Beijing Normal University Department of Physics Beihang University

The magneto-optical Kerr effect susceptometry technique is proposed to determine the uniaxial magnetic anisotropy （UMA） constant Ku. The magnetic properties of Cu/Fe/SiO2/Si grown by dc magnetron sputtering were investigated. The in-plane uniaxial magnetic anisotropy was probed by the magneto-optical Kerr effect （MOKE）. The value of UMA, Ku = 2.5 x 103 J/m3, was simulated from the field dependence of ac susceptibility along the hard axis according to the Stoner-Wohlfarth （S-W） model, which is consistent with Ku = 2.7~ 103 J/m3 calculated from the magnetic hysteresis loops. Our results show that the magneto-optical Kerr effect susceptometry can be employed to determine the magnetic anisotropy constant owing to its high sensitivity.

关键词： ac susceptibility magnetic anisotropy magneto-optical Kerr effect susceptometry

Observation of spin glass transition in spinel LiCoMnO_4

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Chinese Physics B 2015年第12期24卷 530-534页

作者：陈红杨旭张培松梁磊洪源泽魏英进陈岗杜菲王春忠 College of Physics Beihua University Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of Physics Jilin University State Key Laboratory of Superhard Materials Jilin University

Spinel Li CoMnO4 is prepared by solid-state reaction and its magnetic properties are comprehensively studied by direct current（DC） and alternating current（ac） susceptibilities, isothermal remanent magnetizations, and magnetic *** to the Curie–Weiss law by using high-temperature zero-field-cooled susceptibility confirms a low-spin state of Co^3＋with S = 0. Both the fitting parameters first increase and then tend to be saturated at high magnetic fields through using isothermal remanent magnetizations, which suggests a spin glass transition at low temperature. ac susceptibility study also supports this conclusion since the frequency dependence of peak position and intensity follows the tendency of a spin glass transition. The origin of the spin-glass transition in Li CoMnO4 might be attributed to a spatial segregation between non-magnetic Co^3＋regions and spin glass ordered regions of Mn^4＋ions.

关键词： LiCoMnO4 spin glass DC susceptibility ac susceptibility

HARMONIC RESPONSE AND FLUX CREEP OF SUPERCONDUCTOR

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南京大学学报(自然科学) 1999年第5期 634-635页

作者： Ding Shiying (Department of Physics,National Laboratory of Solid State Microstructures,Nanjing University, Center for Advance Studies in Science and Technology of Microstructures,210093,Nanjing, PRC)

FLUX　DYNAMICS　OF　TISr2Ca2Cu3Oy　SUPERCONDUCTOR　IN　THE　TIME　WINDOW　OF　MILLISECONDS

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南京大学学报(自然科学) 1995年第3期 508-509页

作者： Ding Shiying 1) Wang Guoqiang 1) Ren Cong 1) Lin Jianwei 2) Yao Xixian 1)( 1)Departement of Physics and Center for Advance Studies in Science and Technology of Microstructures, Nanjing University, Nanjing, 210093, PRC 2)Department of Math and Physics,

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关键词： flux dynamics ac susceptibility T1-1223 superoonductor