Strong Anisotropic Order Parameters at All-Nitride Ferromagnet/Superconductor Interfaces  

作　　者：Qiao Jin Meng Yang Guozhu Song Nan Zhao Shengru Chen Haitao Hong Ting Cui Dongke Rong Qianying Wang Yiyan Fan Chen Ge Can Wang Jiachang Bi Yanwei Cao Liusuo Wu Shanmin Wang Kui-Juan Jin Zhi-Gang Cheng Er-Jia Guo 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]Department of Physics&Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China [4]Songshan Lake Materials Laboratory,Dongguan 523808,China [5]Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China

出　　处：《Chinese Physics Letters》2024年第2期102-111,共10页中国物理快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant Nos.2020YFA0309100 and 2019YFA0308500);the National Natural Science Foundation of China(Grant Nos.U22A20263,52250308,and 11974390);the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-084)(E.J.G.);Special Research Assistant(Q.J.),the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB33030200)(K.J.);the China Postdoctoral Science Foundation(Grant No.2022M723353);the Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology(Grant No.HTCSNS-DG-CD-0080/2021).

摘　　要：Proximity effects between superconductors and ferromagnets(SC/FM)hold paramount importance in comprehending the spin competition transpiring at their interfaces.This competition arises from the interplay between Cooper pairs and ferromagnetic exchange interactions.The proximity effects between transition metal nitrides(TMNs)are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM interfaces.We fabricated heterostructures comprising SC titanium nitride(TiN)and FM iron nitride(Fe_(3)N)with precise chemical compositions and atomically well-defined interfaces.The magnetoresistance of Fe_(3)N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external perturbations.Moreover,the superconducting transition temperatureT_(C) and critical field of TiN experience notable suppression when proximity to Fe_(3)N.We observe the intriguing competition of interfacial spin orientations near𝑇T_(C)(∼1.25 K).These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets,but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices.

关 键 词：PROXIMITY SUPERCONDUCTOR titanium 

分 类 号：O511.3[一般工业技术—材料科学与工程] O469[理学—低温物理]