Temperature dependent coercivity and magnetization of light rare-earth Nd doped permalloy thin films

Luo, Chen; Fu, Yu; Zhang, Dong; Yuan, Songhu; Zhai, Ya; Dong, Shuai; Zhai, Hongru

doi:10.1016/j.jmmm.2014.09.014

Cited by 19 publications

(7 citation statements)

References 25 publications

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“…as the temperature decreases from 300K to below 100K and then rises as the temperature is further reduced to 5K. This is contrary to the common behavior where HC normally increases with reduction of temperature [36,37]. Hence, such decrease in HC and MR above 100K and increase below 100K can only happen if two phases coexist.…”

Section: -Resultsmentioning

confidence: 75%

Crystallographic and magnetic investigations of textured bismuth ferrite lead titanate layers

Palizdar

Fancher

Mallick

et al. 2018

Mater. Res. Express

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Section: -Resultsmentioning

confidence: 75%

Crystallographic and magnetic investigations of textured bismuth ferrite lead titanate layers

Palizdar

Fancher

Mallick

et al. 2018

Mater. Res. Express

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“…Each new loop has been calculated by setting the temperature at 45 °C (318 K), a value that is expected to be reached during hyperthermia sessions, and by extracting the average curves over 20 stochastic realizations; anyway, taking into account the randomness of thermal fluctuations we can expect practically negligible variations in the magnetization reversal process by varying the temperature within a limited range. The saturation magnetization M S at 318 K has been fixed to 800 kA m −1 , according to the law

M_{normalS} false(T false) = M_{S_{0}} false(1 - b T^{3 / 2} - c T^{5 / 2} - a T^{2} false)

derived from the classical spin‐wave theory, [ 43,44 ] considering

{normalM}_{S_{0}} = 860 normalkA m^{- 1}

, a = 0.19×10 −7 K −2 , b = 0.88×10 –5 K –3/2 , and c = 0.09×10 −7 K −5/2 . [ 44 ]…”

Section: Resultsmentioning

confidence: 99%

From Micromagnetic to In Silico Modeling of Magnetic Nanodisks for Hyperthermia Applications

Manzin

Ferrero

Vicentini

2021

Advcd Theory and Sims

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Magnetic nanodisks have been recently proposed as biomedical tools for therapeutics at the nanoscale level, with a special focus on hyperthermia for cancer cure. Here we present a detailed study of permalloy nanodisks to be used in alternative to superparamagnetic iron oxide nanoparticles, as efficient heating agents that release heat via magnetic hysteresis. A micromagnetic modeling analysis is carried out to identify sizes and ac field parameters that maximize the specific loss power (SLP), guaranteeing the fulfillment of biophysical constraints (Hergt–Dutz limit) and vortex state at remanence (reduced agglomeration effects). The highest SLP (790 W g−1) is found for 100 nm diameter and 20 nm thickness nanodisks, excited at a frequency of 75 kHz. Further analysis elucidates the influence of magnetostatic interactions and local nanodisk‐field orientation on the SLP of nanodisk clusters, which originate from the deposition in target tissues. At high concentrations, magnetostatic interactions can lead to a reduction of 40–50% in the hysteresis losses. From thermal simulations, we finally demonstrate that in a murine model temperature increments comparable to that obtained in calorimetric measurements under quasi‐adiabatic conditions can be achieved only by using an order of magnitude larger dosage of nanodisks, due to blood perfusion effects.

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“…As it was reported Hc < 100 Oe is soft ferromagnetic and Hc > 100 Oe is due to hard ferromagnetic. 25 Therefore, the nanoparticles prepared for 14 h are hard ferromagnetic and those prepared for 10 and 18 h of reaction time have soft ferromagnetic behaviors. It can be seen from Table S8 that the highest values of the residual magnetization (Mr) and also the residual magnetization ratio (R = Mr/Ms) were obtained at 14 h of reaction time, which shows that the particle size is maximum.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 97%

Influence of Fabrication Temperature and Time on Light Olefin Selectivity of Iron–Cobalt–Cerium Mixed Oxide Nanocatalyst for CO Hydrogenation

Lari

Mirzaei

Atashi

2016

Ind. Eng. Chem. Res.

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The Fischer–Tropsch synthesis process is a polymerization reaction in which various chain lengths of product can be produced from a mixture of CO and H2 (synthesis gas). A solvothermal technique was used to synthesize magnetic iron–cobalt–cerium mixed oxide nanoparticles. Process variables such as reaction temperature and time can play an important role in a chemical process. The results showed that the optimal preparation time and temperature in order to enhance light olefin (C2–C4) selectivity is 18 h and 120 °C. The effects of experimental variables including temperature (120, 150, 180 °C) and reaction time (10, 14, 18 h) were investigated. The nanoparticles were characterized by X-ray diffraction (XRD), vibrating sample magnetometry (VSM), temperature programed-reduction (TPR), Fourier infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDS), and X-ray photoelectron spectroscopy (XPS). Average crystalline size determined from XRD patterns ranged over 4.5–8.3 nm. The results indicate that reaction temperature and time have marked effects on the magnetic properties of nanoparticles changing from a ferromagnetic behavior to a superparamagnetic one at a reaction temperature of 120 °C. TPR profiles of the nanoparticles synthesized at different temperatures revealed that reducibility shifted to higher temperatures. XPS results verified Fe3+, Co2+, and Ce3+ of oxidation states.

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Temperature dependent coercivity and magnetization of light rare-earth Nd doped permalloy thin films

Cited by 19 publications

References 25 publications

Crystallographic and magnetic investigations of textured bismuth ferrite lead titanate layers

Crystallographic and magnetic investigations of textured bismuth ferrite lead titanate layers

From Micromagnetic to In Silico Modeling of Magnetic Nanodisks for Hyperthermia Applications

Influence of Fabrication Temperature and Time on Light Olefin Selectivity of Iron–Cobalt–Cerium Mixed Oxide Nanocatalyst for CO Hydrogenation

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