Almessiere Munirah A, Güner Sadik, Gungunes Hakan, Sertkol Murat, Slimani Yassine, Badar Rabail, Akhtar Sultan, Shirsath Sagar E, Baykal Abdulhadi
Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
Department of Biophysics, Institute for Research and Medical Consultation (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
ACS Omega. 2021 Aug 19;6(34):22429-22438. doi: 10.1021/acsomega.1c03416. eCollection 2021 Aug 31.
The effect of Er and Y ion-co-substituted MnZnEr Y Fe O (MZErYF) ( ≤ 0.10) spinel nanoferrites (SNFs) prepared by a sonochemical approach was investigated. Surface and phase analyses were carried out using SEM, TEM, and XRD. Hyperfine parameters were determined by fitting room-temperature (RT) Mossbauer spectra. Magnetic field-dependent magnetization data unveiled the superparamagnetic nature at RT and ferrimagnetic nature at 10 K. RT saturation magnetization ( ) and calculated magnetic moments ( ) are 34.84 emu/g and 1.47 μ, respectively, and have indirect proportionalities with increasing ion content. and data have a similar trend at 10 K including remanent magnetizations ( ). The measured coercivities ( ) are between 250 and 415 Oe. The calculated squareness ratios are in the range of 0.152-0.321 for NPs and assign the multidomain nature for NPs at 10 K. The extracted effective magnetocrystalline constants ( ) have an order of 10 erg/g except for MnZnErYFeO SNFs that has 3.37 × 10 erg/g. This sample exhibits the greatest magnetic hardness with the largest magnitude of = 415 Oe and an internal anisotropy field = 1288 Oe among all magnetically soft NPs.
研究了通过声化学方法制备的铒（Er）和钇（Y）离子共取代的MnZnErₓY₁₋ₓFe₃O₄（MZErYF）（x≤0.10）尖晶石纳米铁氧体（SNFs）的效果。使用扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线衍射（XRD）进行表面和相分析。通过拟合室温（RT）穆斯堡尔谱确定超精细参数。磁场依赖的磁化数据揭示了在室温下的超顺磁性和在10 K时的亚铁磁性。室温饱和磁化强度（Ms）和计算得到的磁矩（μ）分别为34.84 emu/g和1.47 μB，并且随着离子含量的增加呈间接比例关系。Ms和μ数据在10 K时具有相似的趋势，包括剩余磁化强度（Mr）。测量的矫顽力（Hc）在250至415 Oe之间。对于纳米颗粒（NPs），计算得到的矩形比在0.152 - 0.321范围内，并表明在10 K时纳米颗粒具有多畴性质。除了具有3.37×10⁻⁴ erg/g的MnZnErYFeO SNFs外，提取的有效磁晶常数（Keff）具有10⁻⁶ erg/g的量级。在所有软磁纳米颗粒中，该样品表现出最大的磁硬度，最大矫顽力Hc = 415 Oe，内部各向异性场Ha = 1288 Oe。
