CAJ | 학술논문

利用脉冲激光沉积法，在3种不同取向的NSTO基片上，生长得到3种不同取向的Fe3O4外延薄膜。制备了Fe3O4（100）/NSTO（100）、Fe3O4（110）/NSTO（110）、Fe3O4（111）/NSTO（111）3种不同异质结。3种异质结的 I-V曲线都具有很好的整流特性。利用肖特基结（Schottky junction）二极管I-V关系的热激活模型对实验数据进行处理，得到了这3种异质结的势垒高度ΦB随温度的变化关系。对这3种Fe3O4/NSTO异质结的磁阻进行了测量，分析指出Fe3O4的磁各向异性和不同取向异质结的势垒高度差，是造成3种异质结磁阻差异的主要原因。发现3种异质结的磁阻都与Fe3O4的Verwey转变温度(Tv)相关，在120 K处负磁阻最大。
이용맥충격광침적법，재3충불동취향적NSTO기편상，생장득도3충불동취향적Fe3O4외연박막。제비료Fe3O4（100）/NSTO（100）、Fe3O4（110）/NSTO（110）、Fe3O4（111）/NSTO（111）3충불동이질결。3충이질결적 I-V곡선도구유흔호적정류특성。이용초특기결（Schottky junction）이겁관I-V관계적열격활모형대실험수거진행처리，득도료저3충이질결적세루고도ΦB수온도적변화관계。대저3충Fe3O4/NSTO이질결적자조진행료측량，분석지출Fe3O4적자각향이성화불동취향이질결적세루고도차，시조성3충이질결자조차이적주요원인。발현3충이질결적자조도여Fe3O4적Verwey전변온도(Tv)상관，재120 K처부자조최대。
Fe3O4 epitaxial thin films with three different orientations were grown on three different orientated NSTO substrates. Three different heterojunctions Fe3O4 (100)/NSTO (100), Fe3O4 (110)/NSTO (110), Fe3O4 (111)/NSTO (111) were fabricated. The I-V curves of these junctions show rectifying behavior. The temperature dependence of the barrier heightΦB is determined by fitting the I-V curves by using thermoactivation model of schottky junction diode. The magne-toresistance of these Fe3O4/NSTO junctions were investigated. Analysis pointed out that the magnetic anisotropy of Fe3O4 and different orientation of the heterojunction barrier height difference, is caused by three main reasons for heterojunction magne-toresistance of different. The result shows a maximum of magnetoresistance at 120 K indicating that the magnetoresistance is related to the Verwey transition.