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Nd60-xPrxFe30Al10 (x=0, 9, 15)大塊非晶合金的磁粘滯性研究
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國家自然科學(xué)基金（51071099）和上海重點學(xué)科資助項目（S30107）


Study on the Magnetic Viscosity of Nd60-xPrxFe30Al10 (x=0, 9, 15) Bulk Amorphous Alloys
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    摘要:

    對Nd60-xPrxFe30Al10（x=0, 9, 15, at%）大塊非晶合金的磁粘滯行為進(jìn)行了研究，進(jìn)而分析了該類合金的矯頑力產(chǎn)生機(jī)理。結(jié)果表明：Nd60-xPrxFe30Al10（x=0, 9, 15）合金在室溫均表現(xiàn)為硬磁性，隨著Pr元素含量的增加，合金的內(nèi)稟矯頑力iHc逐漸減小。在合金的不可逆磁化率χirr隨外磁場變化的曲線中，均在各自的內(nèi)稟矯頑力附近出現(xiàn)了明顯的峰。Pr元素部分替換Nd元素后，基本不影響合金的磁粘滯變化趨勢。當(dāng)Pr元素含量從0at%增加到15at%時，合金的熱漲落場Hf略有減小，從11.1 mT減小到9.9 mT；激活體積Va由2.6×10-18 cm3增加到2.9×10-18 cm3；激活直徑Da由17.1 nm增加到17.7 nm。激活直徑Da的值與Nd基大塊非晶里的納米晶團(tuán)簇（cluster）的尺寸相當(dāng)，這可能是該類合金具有明顯硬磁性的原因之一。

    Abstract:

    The magnetic viscosity of the bulk amorphous Nd60-xPrxFe30Al10 (x=0, 9, 15) alloys were investigated, and the coercivity mechanism was discussed. The results show that the bulk amorphous Nd60-xPrxFe30Al10 (x=0, 9, 15) alloys present hard magnetic behavior at room temperature. The intrinsic coercivity of the bulk amorphous decreases with increasing of the Pr addition from 0at% to 15at%. A single sharp and narrow peak close to the coercivity appears in the irreversible susceptibility (χirr) curve for each alloy. The addition of Pr has little influence on the magnetic viscosity of the alloys. With the substitution of Pr for Nd, the fluctuation field Hf decreases from 11.1 mT to 9.9 mT, and the activation volume Va increases from 2.6×10-18 cm3 to 2.9×10-18 cm3, which leads to an increase of the activation diameter Da from 17.1 nm to 17.7 nm. The value of Da deduced from the magnetic viscosity measurements is similar to the size of clusters of Nd-based bulk amorphous alloys, which may be responsible for the hard magnetic property exhibited at room temperature.

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范海平,徐 暉,譚曉華,侯金超,滿 華,唐永軍,白 琴. Nd60-xPrxFe30Al10 (x=0, 9, 15)大塊非晶合金的磁粘滯性研究[J].稀有金屬材料與工程,2012,41(7):1251~1254.[Fan Haiping, Xu Hui, Tan Xiaohua, Hou Jinchao, Man Hua, Tang Yongjun, Bai Qin. Study on the Magnetic Viscosity of Nd60-xPrxFe30Al10 (x=0, 9, 15) Bulk Amorphous Alloys[J]. Rare Metal Materials and Engineering,2012,41(7):1251~1254.]
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  • 收稿日期:2011-07-28
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