退火对Zn0.2Mn0.8Fe2O4纳米颗粒磁热性能影响的研究

IF 1.1 4区物理与天体物理 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Magnetics Letters Pub Date : 2023-01-02 DOI:10.1109/LMAG.2022.3233222

Nan N. Liu;Yulia A. Alekhina;Alexander P. Pyatakov;Nikolai S. Perov;Boris B. Kovalev;Gleb B. Sukhorukov;Alexander M. Tishin;Tomomasa Moriwaki;Kenta Nakazawa;Yuko Ichiyanagi

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引用次数: 0

摘要

研究了直径值为9至35nm的退火Zn0.2Mn0.8Fe2O4纳米颗粒的磁性和磁热性能，并与早期研究的未退火Zn0.2Mn0.8Fe2O4-磁性纳米颗粒（MNPs）进行了比较。在两种类型的MNP中都观察到单相尖晶石结构。已经证明，对于大的退火Zn0.2Mn0.8Fe2O4纳米颗粒（24.7，31.4，35.1nm），比吸收率（SAR）的值与磁场的振幅成正比，为～H4。然而，对于早期研究的未退火Zn0.2Mn0.8Fe2O4 MNP，已经发现从13 nm开始的超二次依赖SAR～H5。SAR（d）特性依赖性的显著变化可以通过小退火MNP的磁滞面积的低值来解释，因此，Néel弛豫在这些退火Zn0.2Mn0.8Fe2O4纳米颗粒中的主导作用。

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Investigation of Impact of the Annealing on Magnetothermal Properties of Zn0.2Mn0.8Fe2O4 Nanoparticles

Magnetic and magnetothermal properties of annealed Zn _0.2 Mn _0.8 Fe ₂ O ₄ nanoparticles with diameter value, ranging from 9 to 35 nm, have been investigated and compared with earlier investigated unannealed Zn _0.2 Mn _0.8 Fe ₂ O ₄ magnetic nanoparticles (MNPs). A single-phase spinel structure was observed in both types of MNPs. It has been demonstrated that for the large annealed Zn _0.2 Mn _0.8 Fe ₂ O ₄ nanoparticles (24.7, 31.4, 35.1 nm) the value of specific absorption rate (SAR) is proportional to the amplitude of the magnetic field as ∼ H ⁴ . However, for earlier investigated unannealed Zn _0.2 Mn _0.8 Fe ₂ O ₄ MNPs, superquadratic dependence SAR ∼ H ⁵ have been found starting from 13 nm. Significant change of dependence of the character of SAR (d) may be explained by low values of hysteresis area of small annealed MNPs and, thus, dominant role of Néel relaxation in these annealed Zn _0.2 Mn _0.8 Fe ₂ O ₄ nanoparticles.

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来源期刊

IEEE Magnetics Letters PHYSICS, APPLIED-

CiteScore

2.40

自引率

0.00%

发文量

期刊介绍： IEEE Magnetics Letters is a peer-reviewed, archival journal covering the physics and engineering of magnetism, magnetic materials, applied magnetics, design and application of magnetic devices, bio-magnetics, magneto-electronics, and spin electronics. IEEE Magnetics Letters publishes short, scholarly articles of substantial current interest. IEEE Magnetics Letters is a hybrid Open Access (OA) journal. For a fee, authors have the option making their articles freely available to all, including non-subscribers. OA articles are identified as Open Access.