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Dynamic effects of dipolar interactions on the specific loss power of Mn0.7Zn0.3Fe2O4

In this work, isothermal magnetization and initial dc susceptibility of spheroidal, nearly monodisperse Mn0.7Zn0.3Fe2O4 nanoparticles (typical diameter: 20 nm) prepared by a hydrothermal route have been measured between 10 and 300 K. The high-temperature inverse magnetic susceptibility was always found to follow a linearly temperature dependence. The deviation from the standard superparamagnetic behavior is related to dipolar interaction among nanoparticles. | Dynamic effects of dipolar interactions on the specific loss power of Mn0.7Zn0.3Fe2O4 Vietnam Journal of Science and Technology 56 (1A) (2018) 50-58 DYNAMIC EFFECTS OF DIPOLAR INTERACTIONS ON THE SPECIFIC LOSS POWER OF Mn0.7Zn0.3Fe2O4 Pham Hong Nam1, 2, *, Luong Le Uyen3, Doan Minh Thuy3, Do Hung Manh1, Pham Thanh Phong4, 5, Nguyen Xuan Phuc1 1 Graduate University of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Viet Nam 2 Institute of Materials Science, VAST, 18-Hoang Quoc Viet Road, Cau Giay, Ha noi, Viet Nam 3 Department of Physics, Quy Nhon University; Binh Dinh Province, Viet Nam 4 Theoretical Physics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam 5 Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam * Email: namph.ims@gmail.com Received: 15 August 2017; Accepted for publication: 20 February 2018 ABSTRACT In this work, isothermal magnetization and initial dc susceptibility of spheroidal, nearly monodisperse Mn0.7Zn0.3Fe2O4 nanoparticles (typical diameter: 20 nm) prepared by a hydrothermal route have been measured between 10 and 300 K. The high-temperature inverse magnetic susceptibility was always found to follow a linearly temperature dependence. The deviation from the standard superparamagnetic behavior is related to dipolar interaction among nanoparticles. The results are well explained using interacting superparamagnetic model, which is basically a mean field theory. As a consequence, the dipolar interaction affected the specific loss power of Mn0.7Zn0.3Fe2O4 Keywords: magnetic nanoparticles, interacting superparamagnetic model, spinel. 1. INTRODUCTION In recent years, magnetic fluid hyperthermia (MFH) therapy has been considered as a promising therapy for cancer treatment [1]. In the MFH therapy, energy dissipated from magnetic nanoparticles (MNPs) in an alternating .