Tunable magnetic heating in La▫$_{0.51}$▫Sr▫$_{0.49}$▫MnO▫$_{3}$▫ and La▫$_{0.51}$▫Dy▫$_{0.045}$▫Sr▫$_{0.445}$▫MnO▫$_{3}$▫ nanoparticles

Smari, Mourad (author), Moisiuc, Monica Viorica (author), Al-Haik, Mohammad Y. (author), Astefanoaei, Iordana (author), Stancu, Alexandru (author), Shelkovyi, Fedor (author), Gimaev, Radel (author), Piashova, Julia (author), Zverev, Vladimir I. (author), Haik, Yousef (author)

The use of perovskite manganite nanoparticles in magnetic hyperthermia has attracted significant attention due to their tunable magnetic properties and high specific absorption rate (SAR). In this work, we present a combined experimental and theoretical investigation of the frequency- and amplitude-dependent magnetic heating behavior of La▫$_{0.51}$▫Sr▫$_{0.49}$▫MnO▫$_{3}$▫ (LSMO) and Dy-doped La▫$_{0.51}$▫Dy▫$_{0.045}$▫Sr▫$_{0.445}$▫MnO▫$_{3}$▫ (DLSMO) nanoparticles. The nanoparticles were synthesized via the sol–gel method and characterized by XRD and SEM, while SAR values were experimentally evaluated under varying magnetic field strengths (60–120 Oe) and frequencies (150–300 kHz). In parallel, theoretical modeling based on Néel and Brownian relaxation mechanisms was employed to predict SAR behavior as a function of particle size, magnetic anisotropy, and fluid viscosity. The results reveal that Dy doping enhances magnetic anisotropy, which modifies the relaxation dynamics and leads to a reduction in SAR. The model identifies the optimal nanoparticle size (~18–20 nm) and ferrofluid viscosity to maximize heating efficiency. This combined approach provides a comprehensive framework for designing and optimizing perovskite-based nanoparticles for magnetic hyperthermia applications.

• Language: English
• Keywords: magnetic hyperthermia, perovskite manganite nanoparticles, specific absorption rate (SAR), ferrofluid viscosity, nanoparticle heating efficiency
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 15 str.
• Numbering: Vol. 15, iss. 9, art. 642
• PID: 20.500.12556/RUL-185644
• UDC: 537.622:620.3
• ISSN on article: 2079-4991
• DOI: 10.3390/nano15090642
• COBISS.SI-ID: 287791107
• Publication date in RUL: 14.08.2026

Record is a part of a journal

• Title: Nanomaterials
• Shortened title: Nanomaterials
• Publisher: MDPI AG
• ISSN: 2079-4991
• COBISS.SI-ID: 523286297

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: magnetna hipertermija, perovskitni manganitni nanodelci, specifična hitrost absorpcije, viskoznost ferofluida, učinkovitost segrevanja nanodelcev

Projects

• Funder: Other - Other funder or multiple funders
• Project number: 23021440147
• Name: University of Sharjah’s competitive grant

• Funder: Other - Other funder or multiple funders
• Project number: 24021440166
• Name: University of Sharjah’s competitive grant