scholarly journals Изменение направления оси легкого намагничивания массивов сегментированных нанонитей Ni/Cu с увеличением длины сегмента Ni

2021 ◽  
Vol 63 (7) ◽  
pp. 881
Author(s):  
А.А. Мистонов ◽  
И.С. Дубицкий ◽  
А.Х.А. Елмекави ◽  
Е.Г. Яшина ◽  
С.В. Сотничук ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Easy Axis ◽  
Storage Systems ◽  
Three Dimensional ◽  
Magnetic Behavior ◽  
Diameter Ratio ◽  
Information Storage ◽  
Promising Material ◽  
Segment Length ◽  
Competing Interactions

Arrays of ordered segmented nanowires are considered as a promising material for three-dimensional information storage systems. However, the presence of a large number of competing interactions significantly complicates the description of the magnetic behavior of such systems. In this work, the influence of the length of the nickel segment on the integral magnetic properties of the array is investigated. In particular, it is shown that the change in the direction of the easy axis of magnetization occurs when the segment length to diameter ratio is in the range from 10 to 20.

Hydrothermal synthesis, structure and magnetic properties of a three-dimensional cobalt(ii) – aminophenyltetrazolate coordination polymer

2014 ◽  
Vol 43 (19) ◽  
pp. 7263-7268 ◽  
Author(s):  
Tiffany M. Smith ◽  
Michael Tichenor ◽  
Yuan-Zhu Zhang ◽  
Kim R. Dunbar ◽  
Jon Zubieta
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Hydrothermal Synthesis ◽  
Coordination Polymer ◽  
Three Dimensional ◽  
Magnetic Behavior ◽  
Ac Magnetic Susceptibility

The three-dimensional [Co3(OH)2(H2O)2(aptet)4] exhibits magnetic properties consistent with a ferrimagnetic chain with the non-compensating resultant moment of one Co(ii) per trinuclear Co(ii) subunit and ac magnetic susceptibility indicative of glassy-like magnetic behavior.

scholarly journals Helimagnetism in MnBi2Se4 Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 242
Author(s):  
Judith K. Clark ◽  
Chongin Pak ◽  
Huibo Cao ◽  
Michael Shatruk
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Easy Axis ◽  
Linear Chain ◽  
Magnetic Behavior ◽  
Propagation Direction ◽  
Spin Frustration ◽  
Magnetization Direction ◽  
Turn Angle ◽  
Ordered State

We report the magnetic properties and magnetic structure determination for a linear-chain antiferromagnet, MnBi2Se4. The crystal structure of this material contains chains of edge-sharing MnSe6 octahedra separated by Bi atoms. The magnetic behavior is dominated by intrachain antiferromagnetic (AFM) interactions, as demonstrated by the negative Weiss constant of −74 K obtained by the Curie–Weiss fit of the paramagnetic susceptibility measured along the easy-axis magnetization direction. The relative shift of adjacent chains by one-half of the chain period causes spin frustration due to interchain AFM coupling, which leads to AFM ordering at TN = 15 K. Neutron diffraction studies reveal that the AFM ordered state exhibits an incommensurate helimagnetic structure with the propagation vector k = (0, 0.356, 0). The Mn moments are arranged perpendicular to the chain propagation direction (the crystallographic b axis), and the turn angle around the helix is 128°. The magnetic properties of MnBi2Se4 are discussed in comparison to other linear-chain antiferromagnets based on ternary mixed-metal halides and chalcogenides.

scholarly journals A 3D Silverton-Type Polyoxomolybdate Based on {PrMo12O42}: Synthesis, Structure, Photoluminescence and Magnetic Properties

2021 ◽  
Vol 9 ◽  
Author(s):  
Yanxin Zhao ◽  
Xiaopeng Sun ◽  
Yanfang Ji ◽  
Hui Kong ◽  
Shumin Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Variable Temperature ◽  
Three Dimensional ◽  
Magnetic Behavior ◽  
X Ray Diffraction ◽  
Red Emission ◽  
X Ray ◽  
Variable Temperature Magnetic Susceptibility ◽  
Elemental Analyses ◽  
Inorganic Building Block

A three-dimensional (3D) Silverton-type polyoxomolybdate (POMo) with the formula of NH4{Mn4[PrMo12O42]}·18H2O (1) was successfully isolated and well characterized by single crystal X-ray diffraction, X-ray powder diffraction pattern, infrared spectrum, thermogravimetric and elemental analyses. The inorganic building block {PrMo12O42} has formed 3D frameworks via the {MnO6} linker. The excitation of compound 1 in solid state at 375 nm displays red emission. Moreover, variable temperature magnetic susceptibility measurements indicate that the magnetic behavior in compound 1 is dominated by antiferromagnetic interactions.

Compositional imaging of Co/Cr multilayer by high-angle annular dark-field microscopy

1992 ◽  
Vol 50 (1) ◽  
pp. 258-259
Author(s):  
J. Liu ◽  
Y. Cheng ◽  
M. B. Stearns
Keyword(s):  
Magnetic Properties ◽  
Magnetic Behavior ◽  
High Resolution Electron Microscopy ◽  
Growth Conditions ◽  
Magnetic Multilayers ◽  
Dark Field ◽  
Information Storage ◽  
Atomic Scale ◽  
High Angle ◽  
Annular Dark Field

Magnetic multilayers (ML) have been recently the subject of active research because of their fundamental magnetic behavior (i.e., large magnetoresistance at room temperature and two-dimensional superconductivity etc.) and also because of their potential application as media for perpendicular magnetic recording and information storage. It has been found that the magnetic properties of these ML films strongly depends on their layered structure. Thus it is essential to correlate the growth conditions with the structural, compositional and magnetic properties of the ML films. High resolution electron microscopy (HREM) has proved very useful for providing information about the detailed microstructures of the ML on an atomic scale. But the interpretation of HREM images in terms of chemical modulation across ML films is difficult due to the presence of strong diffraction and phase contrast in HREM images. In this study we have used high-angle annular dark-field (HAADF) microscopy technique to extract compositional information of the e-beam evaporated Co/Cr ML films and to correlate these results with that obtained by HREM.

scholarly journals Substrate-Induced Strain Effect on Structural and Magnetic Properties of La0.5Sr0.5CoO3 Films

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 781
Author(s):  
Miriam Sánchez-Pérez ◽  
Juan Pedro Andrés ◽  
Juan Antonio González ◽  
Ricardo López Antón ◽  
Marco Antonio López de la Torre ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Easy Axis ◽  
Compressive Strain ◽  
Magnetic Behavior ◽  
Strain Effect ◽  
Soft Magnetic ◽  
Spintronic Devices ◽  
Out Of Plane ◽  
Memory Applications ◽  
And Control

We present a detailed study about the substrate-induced strain and thickness effects on the structure and magnetic properties of La0.5Sr0.5CoO3 films. The in-plane tensile or compressive strain imposed by four different substrates configures an in-plane or out-of-plane easy axis, respectively. The presence of a soft magnetic phase at the interface is also conditioned by the type of strain. The obtained results are discussed in terms of the different anisotropies that participate and control the final magnetic behavior. The relevance of these results lies in the feasibility of La0.5Sr0.5CoO3 in memory applications and spintronic devices.

Magnetic Properties of xCeO2•(50 − x) PbO•50B2O3 Glasses and Glass Ceramics

2017 ◽  
Vol 13 (1) ◽  
pp. 4486-4494 ◽  
Author(s):  
G.El Damrawi ◽  
F. Gharghar
Keyword(s):  
Magnetic Properties ◽  
Large Scale ◽  
Glass Ceramics ◽  
Magnetic Behavior ◽  
Crystal Formation ◽  
Dual Roles ◽  
Effective Agent ◽  
Ordered Structures ◽  
Essential Change

Cerium oxide in borate glasses of composition xCeO2·(50 − x)PbO·50B2O3 plays an important role in changing both microstructure and magnetic behaviors of the system. The structural role of CeO2 as an effective agent for cluster and crystal formation in borate network is clearly evidenced by XRD technique. Both structure and size of well-formed cerium separated clusters have an effective influence on the structural properties. The cluster aggregations are documented to be found in different range ordered structures, intermediate and long range orders are the most structures in which cerium phases are involved. The nano-sized crystallized cerium species in lead borate phase are evidenced to have magnetic behavior.  The criteria of building new specific borate phase enriched with cerium as ferrimagnetism has been found to keep the magnetization in large scale even at extremely high temperature. Treating the glass thermally or exposing it to an effective dose of ionized radiation is evidenced to have an essential change in magnetic properties. Thermal heat treatment for some of investigated materials is observed to play dual roles in the glass matrix. It can not only enhance alignment processes of the magnetic moment but also increases the capacity of the crystallite species in the magnetic phases. On the other hand, reverse processes are remarked under the effect of irradiation. The magnetization was found to be lowered, since several types of the trap centers which are regarded as defective states can be produced by effect of ionized radiation. 

Structural, Morphological and Magnetic Characterization of Sm-substituted Ni-Zn Ferrite

2020 ◽  
Vol 10 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Muhammad Hanif bin Zahari ◽  
Beh Hoe Guan ◽  
Lee Kean Chuan ◽  
Afiq Azri bin Zainudin
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Saturation Magnetization ◽  
Sol Gel ◽  
Magnetic Behavior ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Zn Ferrite ◽  
Auto Combustion ◽  
Combustion Technique

Background: Rare earth materials are known for its salient electrical insulation properties with high values of electrical resistivity. It is expected that the substitution of rare earth ions into spinel ferrites could significantly alter its magnetic properties. In this work, the effect of the addition of Samarium ions on the structural, morphological and magnetic properties of Ni0.5Zn0.5SmxFe2-xO4 (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) synthesized using sol-gel auto combustion technique was investigated. Methods: A series of Samarium-substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5SmxFe2-xO4 where x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by sol-gel auto-combustion technique. Structural, morphological and magnetic properties of the samples were examined through X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscope (FESEM) and Vibrating Sample Magnetometer (VSM) measurements. Results: XRD patterns revealed single-phased samples with spinel cubic structure up to x= 0.04. The average crystallite size of the samples varied in the range of 41.8 – 85.6 nm. The prepared samples exhibited agglomerated particles with larger grain size observed in Sm-substituted Ni-Zn ferrite as compared to the unsubstituted sample. The prepared samples exhibited typical soft magnetic behavior as evidenced by the small coercivity field. The magnetic saturation, Ms values decreased as the Sm3+ concentration increases. Conclusion: The substituted Ni-Zn ferrites form agglomerated particles inching towards more uniform microstructure with each increase in Sm3+ substitution. The saturation magnetization of substituted samples decreases with the increase of samarium ion concentration. The decrease in saturation magnetization can be explained based on weak super exchange interaction between A and B sites. The difference in magnetic properties between the samples despite the slight difference in Sm3+ concentrations suggests that the properties of the NiZnFe2O4 can be ‘tuned’, depending on the present need, through the substitution of Fe3+ with rare earth ions.

Three-Dimensional Metal Azide Coordination Polymers with Amino Carboxylate Coligands: Synthesis, Structure, and Magnetic Properties

2009 ◽  
Vol 48 (11) ◽  
pp. 4674-4684 ◽  
Author(s):  
Zi-Lu Chen ◽  
Chun-Fang Jiang ◽  
Wei-Hong Yan ◽  
Fu-Pei Liang ◽  
Stuart R. Batten
Keyword(s):  
Magnetic Properties ◽  
Coordination Polymers ◽  
Three Dimensional ◽  
Metal Azide
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