Tailoring magnetostriction sign of ferromagnetic composite by increasing magnetic field strength
Tailoring magnetostriction sign of ferromagnetic composite by increasing magnetic field strength
复制标题
通过增加磁场强度来定制铁磁复合材料的磁致伸缩符号
DOI：
10.1063/1.4961668
复制
发表时间：
2016
影响因子：
4
通讯作者：
Yan Mi
中科院分区：
文献类型：
--
作者：
Gou Junming;Liu Xiaolian;Wu Kaiyun;Wang Yue;Hu Shanshan;Zhao Hui;Xiao Andong;Ma Tianyu;Yan Mi
单相铁磁体在磁场作用下的单一形变，即正线性磁致伸缩或负线性磁致伸缩，只允许单调控制。本文报道了一种铁磁复合材料Fe73Ga27，其磁致伸缩系数随磁场强度的增加而由正变负。在此二元系中体心立方(Bcc)相向面心立方(Fcc)相转变的基础上，将体心立方相(Bcc)平均前驱体在803 K时效3d，制备了Fe73Ga27复合材料。磁性测量表明，体心立方相的磁晶各向异性常数比面心立方相小。体心立方和面心立方相之间的偏置效应在低磁场下产生正的净磁致伸缩，在强磁场下产生负的净磁致伸缩。通过调节电场强度，这种复合材料可以将压应变和拉伸应变传递给其他功能材料，如压电材料或光纤。
The unitary deformation of single-phase ferromagnets by a magnetic field, i.e., either positive or negative linear magnetostriction, allows only monotonous control. Here we report a proof-of-principle ferromagnetic composite Fe73Ga27, for which the magnetostriction sign changes from positive to negative by increasing the magnetic field strength. Based on the transformation from body-centered-cubic (BCC) to face-centered-cubic (FCC) phases in this binary system, Fe73Ga27 composite is prepared by aging the BCC averaged precursor for 3 days at 803 K. Magnetic measurements indicate that the BCC phase exhibits smaller magnetocrystalline anisotropy constant than the FCC phase. The offset effect between BCC and FCC phases produces positive net magnetostriction at low magnetic fields but negative net magnetostriction at high magnetic fields. By tuning the field strength, such composites can mediate compressive and tensile strains to other functional materials, e.g., piezoelectric material or optic-fibers, which i...