Magneto-transport properties of La0.7Sr0.3MnO3–manganese oxide composite films on YSZ substrates prepared using aerosol deposition
Magneto-transport properties of La0.7Sr0.3MnO3–manganese oxide composite films on YSZ substrates prepared using aerosol deposition
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DOI：
10.1016/j.ceramint.2014.08.071
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发表时间：
2015
影响因子：
5.2
通讯作者：
Hyojin Kim;S. Cho;Y. J. Yoon;S. Yoo
中科院分区：
文献类型：
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作者：
Hyojin Kim;S. Cho;Y. J. Yoon;S. Yoo
本文报道了用气溶胶沉积法在YSZ（钇稳定氧化锆）衬底上制备的纯La0.7Sr0.3MnO3（LSMO）和40 mol% LSMO-Mn 3 O 4（LSMM）复合薄膜的磁输运性质。将经由AD沉积的膜在空气中在1100 °C和1200 °C下后退火2小时。沉积态薄膜通常表现出较差的低场磁电阻（LFMR）特性，居里温度（Tc）降低，而退火后的薄膜表现出非常好的LFMR特性，高Tc值范围为355至370 K。在1200 °C下退火的LSMM复合膜在300 K下获得了0.5 kOe时的最高LFMR值1.2%和前所未有的高（dMR/dH）max值158.8%kOe− 1。与纯LSMO薄膜相比，LSMM复合薄膜具有更高的LFMR值和更高的（dMR/dH）max值，这主要归因于化学相容的Mn 3 O 4相大大减少了LSMO晶界附近的磁无序区。
We report the magneto-transport properties of pure La0.7Sr0.3MnO3(LSMO) and 40 mol% LSMO–Mn3O4(LSMM) composite films on YSZ (yttrium stabilized zirconia) substrates prepared using aerosol deposition (AD). As-deposited films via AD were post-annealed at 1100 °C and 1200 °C for 2 h in air. While the as-deposited films commonly exhibited a poor low-field magnetoresistance (LFMR) property with reduced Curie temperatures (Tc), post-annealed films exhibited a very good LFMR property with highTcvalues ranging from 355 to 370 K. The highest LFMR value of 1.2% in 0.5 kOe and an unprecedentedly high (dMR/dH)maxvalue of 158.8%kOe−1were obtainable at 300 K from the LSMM composite film annealed at 1200 °C. Compared with a pure LSMO film, the LSMM composite films possess higher LFMR values with higher (dMR/dH)maxvalues, which is primarily attributed to a greatly reduced magnetically disordered region near the LSMO grain boundary because of the chemically compatible Mn3O4phase.