锰锌铁氧体Mn0.2Zn0.2Fe2.6O4纳米颗粒的尺寸依赖空间磁化分布
Size-dependent spatial magnetization profile of manganese-zinc ferrite Mn0.2Zn0.2Fe2.6O4 nanoparticles
AI总结：
本研究通过非偏振小角中子散射结合微磁模拟，探究不同尺寸锰锌铁氧体纳米颗粒的磁化构型，证实小颗粒均匀磁化、大颗粒磁化不均，且自旋无序随磁场增强被抑制，展现SANS检测微小磁化偏差的独特能力。
摘要：
我们报道了一项针对锰锌铁氧体（MZFO）磁性纳米颗粒的非偏振小角中子散射（SANS，Small-Angle Neutron Scattering）研究结果，旨在阐明其颗粒尺寸与磁化构型之间的相互作用。我们研究了平均直径在8至80 nm之间的不同单晶MZFO纳米颗粒样品，并证实最小的颗粒具有均匀磁化特性。然而，随着纳米颗粒尺寸增大，我们观察到从均匀磁化态到非均匀磁化态的转变。关联函数的场依赖结果证实，内部自旋无序会随着磁场强度的升高而被抑制。实验SANS数据得到了微磁模拟结果的支持，模拟结果证实，随着尺寸增大，纳米颗粒磁化分布的不均匀性会增加。本研究结果证明了SANS具备检测磁化态与均匀态之间哪怕极微小偏差的独特能力。
英文摘要：
We report the results of an unpolarized small-angle neutron scattering (SANS) study on Mn-Zn ferrite (MZFO) magnetic nanoparticles with the aim to elucidate the interplay between their particle size and the magnetization configuration. We study different samples of single-crystalline MZFO nanoparticles with average diameters ranging between 8 to 80 nm, and demonstrate that the smallest particles are homogeneously magnetized. However, with increasing nanoparticle size, we observe the transition from a uniform to a nonuniform magnetization state. Field-dependent results for the correlation function confirm that the internal spin disorder is suppressed with increasing field strength. The experimental SANS data are supported by the results of micromagnetic simulations, which confirm an increasing inhomogeneity of the magnetization profile of the nanoparticle with increasing size. The results presented demonstrate the unique ability of SANS to detect even very small deviations of the magnetization state from the homogeneous one.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
