Exchange-coupling properties of La1-xCaMnO3 ferromagnetic/antiferromagnetic multilayers -: art. no. 094429
Exchange-coupling properties of La1-xCaMnO3 ferromagnetic/antiferromagnetic multilayers -: art. no. 094429
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DOI：
10.1103/physrevb.64.094429
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发表时间：
2001-09-01
影响因子：
3.7
通讯作者：
Niarchos, D
中科院分区：
文献类型：
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作者：
Moutis, N;Christides, C;Niarchos, D
由La 1-xCaxMnO 3铁磁（FM）层（x=0.33，0.4.用脉冲激光沉积法在（001）LaAlO 3上生长了La 1-yCayMnO 3（y= 0.48）和La 1-yCayMnO 3（y=0.52，0.67，0.75）反铁磁层。热磁和等温磁、磁输运测量揭示了在阻断温度T（B）低于70 K时的交换偏置机制。在5 K和TB之间，所观察到的矫顽场（H-c）和交换偏置场（H-EB）的指数热衰减遵循场冷却曲线中的磁化强度下降（M-FC）。所有的实验结果表明，热涨落，不同的自旋波退磁。引起M-FC的指数热衰减，并确定在低T下观察到的H-c和H-EB的行为。外推到零温的H-c和H-EB值与平均界面浓度xi=（x+y）/2呈准线性关系，当x=0.4时，界面浓度xi=（x+y）/2随x的增加而增加，当y=0.67时，界面浓度xi =（x + y）/2随x的增加而减少。
Compositionally modulated structures consisting of La1-xCaxMnO3 ferromagnetic (FM) layers (x=0.33, 0.4. 0.48) and La1-yCayMnO3 antiferromagnetic (AF) layers (y=0.52, 0.67, 0.75) were grown on (001)LaAlO3 by pulsed laser deposition. Thermomagnetic and isothermal magnetic, magnetotransport measurements reveal an exchange biasing mechanism below a blocking temperature T(B)approximate to 70 K. Between 5 K and TB, the observed exponential thermal decay of coercive (H-c) and exchange biasing (H-EB) fields follows the drop of magnetization (M-FC) in the field-cooling curves. All the experimental results indicate that thermal fluctuations, different from spin-wave demagnetization. give rise to exponential thermal decay of M-FC and determine the observed behavior of H-c and H-EB at low T. The extrapolated values of H-c and H-EB to zero temperature exhibit a quasilinear dependence on the average interfacial concentration xi=(x+y)/2, both decreasing for fixed y=0.67 while x increases or both increasing for fixed x=0.4 while y increases.