Lee Jae-Hyeok, Kim Yongsub, Kim Sang-Koog
National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, South Korea.
Sci Rep. 2022 Mar 28;12(1):5232. doi: 10.1038/s41598-022-09159-z.
We experimentally demonstrated that heat-dissipation power driven by ferromagnetic resonance (FMR) in superparamagnetic nanoparticles of ferrimagnetic MFeO (M = Fe, Mn, Ni) gives rise to highly localized incrementation of targeted temperatures. The power generated thereby is extremely high: two orders of magnitude higher than that of the conventional Néel-Brownian model. From micromagnetic simulation and analytical derivation, we found robust correlations between the temperature increment and the intrinsic material parameters of the damping constant as well as the saturation magnetizations of the nanoparticles' constituent materials. Furthermore, the magnetization-dissipation-driven temperature increments were reliably manipulated by extremely low strengths of applied AC magnetic fields under resonance field conditions. Our experimental results and theoretical formulations provide for a better understanding of the effect of FMR on the efficiency of heat generation as well as straightforward guidance for the design of advanced materials for control of highly localized incrementation of targeted temperatures using magnetic particles in, for example, magnetic hyperthermia bio-applications.
我们通过实验证明，亚铁磁性MFeO（M = Fe、Mn、Ni）超顺磁性纳米颗粒中铁磁共振（FMR）驱动的散热功率会导致目标温度的高度局部升高。由此产生的功率极高：比传统的奈尔-布朗模型高出两个数量级。通过微磁模拟和解析推导，我们发现温度升高与阻尼常数以及纳米颗粒组成材料的饱和磁化强度等本征材料参数之间存在稳健的相关性。此外，在共振场条件下，通过极低强度的外加交流磁场能够可靠地控制磁化耗散驱动的温度升高。我们的实验结果和理论公式有助于更好地理解FMR对发热效率的影响，也为设计先进材料提供了直接指导，以便利用磁性颗粒在例如磁热疗生物应用中控制目标温度的高度局部升高。
