单晶Ta_(3)FeS_(6)薄膜中巨大的矫顽场

Giant coercivity in single crystal Ta_(3)FeS_(6) film

范德瓦耳斯层状铁磁材料不但为基础磁学的前沿研究提供了重要的平台,同时在下一代自旋电子器件中展示了广阔的应用前景.本文利用化学气相传输方法生长了高质量的、具有本征铁磁性的Ta_(3)FeS_(6)块材单晶.通过机械剥离法得到厚度19—100 nm的Ta_(3)FeS_(6)薄层样品,并发现相应的居里温度在176—133 K之间.低温反常霍尔测量表明Ta_(3)FeS_(6)样品具有面外的铁磁性,其矫顽场在1.5 K可达到7.6 T,这是迄今为止在范德瓦耳斯铁磁薄膜材料中报道的最大数值.此外,在变温过程中,还观察到磁滞回线极性的翻转.相比于通常的范德瓦耳斯磁性材料,Ta_(3)FeS_(6)具有空气稳定性和极大的矫顽场,这为探索稳定的、可小型化的范德瓦耳斯自旋电子器件研究开辟了全新的平台.

Van der Waals(vdW)layered ferromagnetic materials provide a unique platform for fundamental spintronic research,and have broad application prospects in the next-generation spintronic devices.In this study,we synthesize high-quality single crystals of vdW intrinsic ferromagnet Ta_(3)FeS_(6)by the chemical vapor transport method.We obtain thin layer samples of Ta_(3)FeS_(6)with thickness values ranging from 19 to 100 nm by the mechanical exfoliation method,and find that their corresponding Curie temperatures are between 176 and133 K.The anomalous Hall measurement shows that the Ta_(3)FeS_(6)has out-of-plane ferromagnetism with the coercivity reaching 7.6 T at 1.5 K,which is the largest value in those of the layered vdW ferromagnetic materials reported so far.In addition,we observe that the reversal polarity of the hysteresis loop changes sign with temperature increasing.Our work provides an opportunity to construct stable and miniaturized spintronic devices and present a new platform for studying spintronics based on van der Waals magnetic materials.