Cation distribution dependent magnetic properties in CoCr2−xFexO4 (x = 0.1 to 0.5): EXAFS, Mössbauer and magnetic measurements

2017 ◽  
Vol 46 (31) ◽  
pp. 10300-10314 ◽  
Author(s):  
D. Kumar ◽  
A. Banerjee ◽  
A. Mahmoud ◽  
Chandana Rath
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Cation Distribution ◽  
Magnetic Measurements ◽  
Magnetic Transitions ◽  
Ferrimagnetic Phase ◽  
Evolution Of Structure ◽  
Lock In

Evolution of structure and rich magnetic transitions such as paramagnetic to ferrimagnetic phase transition at Curie temperature (TC), spiral ordering temperature (TS) and lock-in temperature (TL) have been discussed in CoCr2O4 spinel multiferroic after substituting Fe.

Cation distribution, magnetic properties and cubic-perovskite phase transition in bismuth-doped nickel ferrite

2017 ◽  
Vol 74 ◽  
pp. 88-94 ◽  
Author(s):  
Shyam K. Gore ◽  
Santosh S. Jadhav ◽  
Umakant B. Tumberphale ◽  
Shoyeb M. Shaikh ◽  
Mu Naushad ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Cation Distribution ◽  
Nickel Ferrite ◽  
Perovskite Phase

Magnetic Properties of the Gd1-xTbxNi3 Intermetallic Compounds

2011 ◽  
Vol 170 ◽  
pp. 109-113 ◽  
Author(s):  
Anna Bajorek ◽  
Grażyna Chełkowska ◽  
Artur Chrobak ◽  
Marzena Kwiecień-Grudziecka
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Saturation Magnetization ◽  
Intermetallic Compounds ◽  
Applied Magnetic Field ◽  
Magnetic Measurements ◽  
Zero Field ◽  
Zero Field Cooling ◽  
Field Cooling

The paper presents selected magnetic properties of the Gd1-xTbxNi3 intermetallic compounds. Based on the wide-ranging SQUID magnetometer (Quantum Design MPMS, temperature from 1.9K to 300K and magnetic field up to 7T) series of different magnetic measurements were carried out. In studied system the saturation magnetization and the Curie temperature strongly depends of Tb concentration. Moreover, the so-called field cooling - zero field cooling (FC-ZFC) curves reveal a dependence of M(T) on the applied magnetic field. The thermomagnetic curves indicate interesting behaviour which is typical for terbium compounds and can be ascribed to the interaction between different aligned magnetic subblattices.

scholarly journals Specific Loss Power of Co/Li/Zn-Mixed Ferrite Powders for Magnetic Hyperthermia

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2151
Author(s):  
Gabriele Barrera ◽  
Marco Coisson ◽  
Federica Celegato ◽  
Luca Martino ◽  
Priyanka Tiwari ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Cation Distribution ◽  
Biomedical Applications ◽  
Magnetic Measurements ◽  
Magnetic Hyperthermia ◽  
Alternating Magnetic Field ◽  
Specific Loss ◽  
Specific Loss Power ◽  
Auto Combustion

An important research effort on the design of the magnetic particles is increasingly required to optimize the heat generation in biomedical applications, such as magnetic hyperthermia and heat-assisted drug release, considering the severe restrictions for the human body’s exposure to an alternating magnetic field. Magnetic nanoparticles, considered in a broad sense as passive sensors, show the ability to detect an alternating magnetic field and to transduce it into a localized increase of temperature. In this context, the high biocompatibility, easy synthesis procedure and easily tunable magnetic properties of ferrite powders make them ideal candidates. In particular, the tailoring of their chemical composition and cation distribution allows the control of their magnetic properties, tuning them towards the strict demands of these heat-assisted biomedical applications. In this work, Co0.76Zn0.24Fe2O4, Li0.375Zn0.25Fe2.375O4 and ZnFe2O4 mixed-structure ferrite powders were synthesized in a ‘dry gel’ form by a sol-gel auto-combustion method. Their microstructural properties and cation distribution were obtained by X-ray diffraction characterization. Static and dynamic magnetic measurements were performed revealing the connection between the cation distribution and magnetic behavior. Particular attention was focused on the effect of Co2+ and Li+ ions on the magnetic properties at a magnetic field amplitude and the frequency values according to the practical demands of heat-assisted biomedical applications. In this context, the specific loss power (SLP) values were evaluated by ac-hysteresis losses and thermometric measurements at selected values of the dynamic magnetic fields.

Effect of size reduction on cation distribution and magnetic transitions in CoCr2O4 multiferroic: EXAFS, magnetic and diffused neutron scattering measurements

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63809-63819 ◽  
Author(s):  
Jagadish K. Galivarapu ◽  
D. Kumar ◽  
A. Banerjee ◽  
V. Sathe ◽  
Giuliana Aquilanti ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Cation Distribution ◽  
Magnetic Measurements ◽  
Size Reduction ◽  
Magnetic Transitions ◽  
Scattering Measurements

Demonstration of rich sequences of magnetic transitions in 10 and 50 nm particles of CoCr2O4 is shown through dc, ac magnetic measurements, EXAFS and diffused neutron scattering.

scholarly journals Anomalous behavior above the Curie temperature in (Nd1−xGdx)0.55Sr0.45MnO3 (x = 0, 0.1, 0.3 and 0.5)

RSC Advances ◽  
2019 ◽  
Vol 9 (47) ◽  
pp. 27541-27548 ◽  
Author(s):  
R. Kamel ◽  
A. Tozri ◽  
E. Dhahri ◽  
E. K. Hlil
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Anomalous Behavior

Magnetic properties were studied just above the ferromagnetic–paramagnetic (FM–PM) phase transition of (Nd1−xGdx)0.55Sr0.45MnO3 with x = 0, 0.1, 0.3 and 0.5.

Electrolytic Hydriding of La(Fe, Si)13 Based Materials and its Magnetocaloric Effect

2014 ◽  
Vol 809-810 ◽  
pp. 443-448 ◽  
Author(s):  
Kun Yang ◽  
Na Tian ◽  
Cai Yin You
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
External Field ◽  
Curie Temperature ◽  
Surface Morphology ◽  
Order Phase Transition ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Second Order Phase Transition

In this paper, the hydriding of La (Fe, Fe)13 based alloys was realized by the electrolytic method and the effect of electrolytic temperature on the hydriding was investigated. The phase components and surface morphology were analyzed by XRD and SEM. The magnetic properties of samples were characterized using VSM. Results showed that the electrolytic hydriding process was enhanced by increasing the electrolytic temperature. The Curie temperature was increased from 196 K to 325 K. Through Arrot-plot analyses, it was found that the phase transition of samples tends to be a second order phase transition. The magnetic entropy change was reduced from 8.03 J/(kg•K) to 2.03 J/(kg•K) under a maximum external field of 1.5 T.

scholarly journals Electronic and magnetic properties of monolayer α-RuCl3: a first-principles and Monte Carlo study

2018 ◽  
Vol 20 (2) ◽  
pp. 997-1004 ◽  
Author(s):  
S. Sarikurt ◽  
Y. Kadioglu ◽  
F. Ersan ◽  
E. Vatansever ◽  
O. Üzengi Aktürk ◽  
...  
Keyword(s):  
Phase Transition ◽  
Monte Carlo ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Specific Heat ◽  
First Principles ◽  
Monte Carlo Study ◽  
Electronic And Magnetic Properties ◽  
Chemical Exfoliation

Recent experiments revealed that monolayer α-RuCl3 can be obtained by a chemical exfoliation method and exfoliation or restacking of nanosheets can manipulate the magnetic properties of the materials. Thermal variations of magnetization and specific heat curves indicate that monolayer α-RuCl3 exhibits a phase transition between ordered and disordered phases at the Curie temperature of 14.21 K.

A Raman signature of the incommensurate-commensurate phase transition (lock-in) in a crystalline monomer diacetylene : pTS

1982 ◽  
Vol 43 (5) ◽  
pp. 755-759 ◽  
Author(s):  
M. Bertault ◽  
M. Krauzman ◽  
M. Le Postollec ◽  
R.M. Pick ◽  
M. Schott
Keyword(s):  
Phase Transition ◽  
Commensurate Phase ◽  
Lock In

Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

2020 ◽  
Vol 16 (4) ◽  
pp. 655-666
Author(s):  
Mona Rekaby
Keyword(s):  
Magnetic Properties ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Structural Defects ◽  
Ferromagnetic Behavior ◽  
Secondary Phases ◽  
Antiferromagnetic Ordering ◽  
Doped Zno ◽  
Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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