Frequency-dependent dynamic magnetic properties of the Ising bilayer system consisting of spin-3/2 and spin-5/2 spins

2018 ◽  
Vol 496 ◽  
pp. 79-89 ◽  
Author(s):  
Mustafa Keskin ◽  
Mehmet Ertaş
Keyword(s):  
Magnetic Properties ◽  
Frequency Dependent ◽  
Bilayer System

Magnetic properties of the site-diluted spin-1/2 Ising bilayer system

2007 ◽  
Vol 601 (18) ◽  
pp. 4256-4260 ◽  
Author(s):  
A. Ainane ◽  
P. Häussler ◽  
K. Htoutou ◽  
M. Saber
Keyword(s):  
Magnetic Properties ◽  
Bilayer System

scholarly journals Magnetic Susceptibility of Soils from Eastern Botswana: A Reconnaissance Survey and Potential Applications

2015 ◽  
Vol 7 (4) ◽  
pp. 45 ◽  
Author(s):  
Rubeni Tawanda Ranganai ◽  
Moikwathai Moidaki ◽  
James G. King
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Land Use Planning ◽  
Magnetic Measurements ◽  
Parent Material ◽  
Appreciable Amount ◽  
Frequency Dependent ◽  
Magnetic Susceptibilities ◽  
Basement Rocks ◽  
Rock And Soil

<p class="zhengwen">Soil magnetic properties measurements are relatively fast and inexpensive but have been proved to be sufficient for preliminary investigations in diverse socio-developmental issues. This paper presents results of a reconnaissance study of soil colour and magnetic susceptibility (c) in eastern Botswana, where ~80% of the population resides. The work is a first step to creating a database of rock and soil magnetic properties and to document spatial variations in magnetic properties in the country. These measurements are important as constraints for interpretation of available aeromagnetic data and can also be exploited for environmental soil research (pollution) and land-use planning (agriculture). The soils sampled include derivatives of varying types and provenance such as Archean gneissic granitoids, metamorphosed rocks (granulites), volcano-sedimentary assemblages, Karoo basalts, and alluvial sediments. A soil colour chart was used since soil colours and magnetic properties are diagnostic of its parent rock sources and weathering profiles. Soil magnetic susceptibilities were measured at both low frequency (0.46 MHz, clf) and high frequency (4.6 MHz, chf), thus allowing calculation of frequency-dependent susceptibility (cfd, cfd%) for detecting ultra-fine ferromagnetic minerals.</p>It was found that soils with Hues ranging from 7.5YR to 10YR have appreciable amount of magnetic materials and soils with Hues of 2.5YR are generally nonmagnetic. The results of soil magnetic susceptibility profiles show spatial variation closely related to the variation in basement rocks, which provides excellent evidence that the magnetic susceptibility variation reflects basement rocks or bedrock composition (soil parent material). In relation to the Botswana physiographic units, soils from the hardveld (Precambrian) show the highest susceptibilities, followed by those from the sandveld, with the lowest values being from the alluvial. The frequency dependent magnetic susceptibilities indicate the presence of ultra-fine super-paramagnetic minerals such as magnetite/maghemite. It is suggested that a systematic and continuous programme of rock and soil magnetic measurements would benefit various socio-economic and development priority sectors of Botswana. This also applies to many developing countries in Africa where soil physics and measurement of soil susceptibility in particular, is generally still at an embryonic stage.

Magnetic properties of the transverse ferrimagnetic bilayer system with disordered interfaces

2002 ◽  
Vol 250 ◽  
pp. 138-159 ◽  
Author(s):  
M. Bentaleb ◽  
N. El Aouad ◽  
B. Laaboudi ◽  
M. Saber
Keyword(s):  
Magnetic Properties ◽  
Bilayer System

Octahedron-shaped three-shell Ln14-substituted polyoxotungstogermanates encapsulating a W4O15 cluster: luminescence and frequency dependent magnetic properties

2019 ◽  
Vol 55 (19) ◽  
pp. 2857-2860 ◽  
Author(s):  
Yong-Jiang Wang ◽  
Shi-Yu Wu ◽  
Yan-Qiong Sun ◽  
Xin-Xiong Li ◽  
Shou-Tian Zheng
Keyword(s):  
Magnetic Properties ◽  
Shell Structure ◽  
Frequency Dependent

The octahedron-shaped three-shell structure of the [(Ln14(H2O)W4(OH)O14)(WO4)4(GeW10O38)6]43− polyanion contains a W4 tetrahedron, a Ln14W4 tetrahedron and a Ge6W60 octahedron.

Frequency-dependent susceptibility and other magnetic properties of Celtic and Mediaeval graphitic pottery from Bohemia: an introductory study

2011 ◽  
Vol 56 (3) ◽  
pp. 803-825 ◽  
Author(s):  
Marta Chlupáčová ◽  
František Hrouda ◽  
Daniel Nižňanský ◽  
Václav Procházka ◽  
Zdeňka Petáková ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Frequency Dependent

Dynamic hysteresis modeling for soft magnetic composites based on isotropic vector play model and Cauer ladder network

2019 ◽  
Vol 38 (5) ◽  
pp. 1413-1426
Author(s):  
Naoya Watanabe ◽  
Yasuhito Takahashi ◽  
Koji Fujiwara
Keyword(s):  
Finite Element ◽  
Magnetic Properties ◽  
Equivalent Circuit ◽  
Eddy Currents ◽  
Modeling Method ◽  
Soft Magnetic ◽  
Frequency Dependent ◽  
Content Type ◽  
Dynamic Hysteresis ◽  
Hysteresis Modeling

Purpose This paper aims to propose an effective modeling method of dynamic hysteresis properties for soft magnetic composite (SMC) core using an equivalent circuit representation. Because the eddy currents flowing inside iron powder particles should be considered, it is well known that an accurate magnetic field analysis of the SMC core in a wide range of excitation frequency is not easy. To overcome this difficulty, a dynamic hysteresis modeling based on the standard Cauer circuit is investigated. Design/methodology/approach In the proposed method, the first inductance represents the static magnetic property of the SMC, and the latter part represents the dynamic effect because of the eddy currents. The values of the circuit elements were determined by an optimization method based on symmetric loops measured at several frequencies. To verify the validity of the proposed modeling method, finite-element analyses of a ring core inductor and an alternating current reactor were performed. Findings By comparing the simulated and measured magnetic properties, the necessity to consider magnetic hysteresis in the equivalent circuit model is clarified. Furthermore, the frequency-dependent inductances of practical reactors can be obtained from the finite-element analysis combined with the proposed method. Originality/value This paper demonstrates the significance of determining the circuit parameters in the equivalent circuit for dynamic hysteresis modeling based on the measured magnetic properties. The effectiveness of the proposed method is verified by comparing frequency-dependent inductances of two kinds of reactors between the simulation and measurement.

Dodenuclear [MnIII8LnIII4] clusters with 2-(hydroxymethyl)pyridine: syntheses, structures, and magnetic properties

2015 ◽  
Vol 44 (48) ◽  
pp. 20964-20971 ◽  
Author(s):  
Lei Sun ◽  
Hui Chen ◽  
Chengbing Ma ◽  
Changneng Chen
Keyword(s):  
Magnetic Properties ◽  
Magnetic Relaxation ◽  
Frequency Dependent ◽  
Peak Maximum ◽  
Slow Magnetic Relaxation

Dodenuclear Mn/Ln clusters with 2-(hydroxymethyl)pyridine as a ligand have been synthesized. Complexes 1 and 5 showed a frequency-dependent decrease in χ′MT and an out-of-phase χ′′M peak maximum, indicating slow magnetic relaxation and potential SMM behaviour.

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