Strong suppression of Curie temperature of spin-polarized ferromagnet La1−<i>x</i>Sr<i>x</i>MnO3 by application of dynamic strain

Mito, Masaki; Tsuruta, Kazuki; Tajiri, Takayuki; Ikeda, Naoshi; Ohkuma, M.; Kohno, Atsushi; Konishi, Kensuke; Deguchi, Hiroyuki

doi:10.1063/1.5124951

Cited by 1 publication

(1 citation statement)

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“…The measured T C 's of the samples were determined as ascribed above from the M vs. T curves and their values are displayed in table 1. From these results, we highlight some pieces of information: (i) as we increase the strontium content, the T C also increases, which is expected for the range of concentration studied (0.2 ⩽ x ⩽ 0.3) [33,34]; (ii) the influence of nanoparticle size is notable since the T C increases with this parameter, considering each composition individually; and (iii) moreover, the Sr content plays an important role under the M s . For instance, for LSMO-0.200-800 with a diameter of 24 nm, despite the lower Sr concentration, the transition temperature is T C = 343 K (70 • C), which is considerably are magnetic saturation, remanence and coercivity at 300 K, respectively, and T B , T C and Tmax are in order, the blocking, Curie and maximum hyperthermia temperatures.…”

Section: Magnetic Transitionmentioning

confidence: 52%

Tuning between composition and nanoparticle size of manganites for self-regulated magnetic hyperthermia applications

Caraballo-Vivas

Santos

Valente-Rodrigues

et al. 2023

J. Phys. D: Appl. Phys.

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Self-regulated magnetic hyperthermia is a promising alternative for cancer treatment based on tumor annihilation by heating using appropriate Curie temperature ($T_{C}$) as an internal temperature controller. We successfully prepared strontium-doped lanthanum manganite nanoparticles (LSMO-$x$) using the sol-gel method. The $T_{C}$ can be adjusted by modifying both the composition and diameter of the particles, that is, varying the Sr content (0.2 $\leq$ x $\leq$ 0.3) and the annealing temperature (600, 700, and 800 °C). Structural, morphological, chemical, and magnetic properties were investigated. The samples exhibit the structure of perovskites with average particle sizes ranging from 17 nm to 27 nm, depending on the annealing temperature. This diameter range ensures that all samples investigated are have negligible remanence at room temperature. Magnetization studies show that $T_{C}$ increases as Sr content and particle size increase, indicating that the $T_{C}$ is governed by both. Thus $T_{C}$ can be adjusted by combining these two parameters for self-regulated magnetic hyperthermia. Magnetic hyperthermia measurements showed that samples with larger particle sizes ($\geq$ 19 nm) were more efficient in promoting heat, that is, presenting a higher specific absorption rate (SAR), probably due to the adequate balance between the Néel and Brownian relaxations behavior. We figure out that the SAR value is essential for this specific finality, but it should also consider the maximum temperature reached during the hyperthermia essays. Finally, we build up a nanoparticle diameter vs. Sr concentration phase diagram, where the SAR values are displayed, which allows for predicting the best sample for the self-regulated hyperthermia

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Section: Magnetic Transitionmentioning

confidence: 52%