Syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

Author:

Jin Qiao1,Zhang Qinghua1,Bai He2,Yang Meng13,Ga Yonglong4,Chen Shengru13,Hong Haitao13,Cui Ting13,Rong Dongke13,Lin Ting13,Wang Jia-Ou5,Ge Chen136ORCID,Wang Can136,Cao Yanwei4,Gu Lin7,Song Guozhu8,Wang Shanmin8ORCID,Jiang Kun136,Cheng Zhi-Gang1ORCID,Zhu Tao136,Yang Hongxin9,Jin Kui-juan136,Guo Er-Jia136

Affiliation:

1. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China

2. Spallation Neutron Source Science Center , Dongguan 523803 , China

3. Department of Physics & Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences , Beijing 100049 , China

4. Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences , Ningbo 315201 , China

5. Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049 , China

6. Songshan Lake Materials Laboratory , Guangdong 523808 , China

7. National Center for Electron Microscopy in Beijing and School of Materials Science and Engineering, Tsinghua University , Beijing 100084 , China

8. Department of Physics, Southern University of Science and Technology , Shenzhen 518055 , China

9. School of Physics, Zhejiang University , Hangzhou 310027 , China

Abstract

ABSTRACT The magnetic correlations at the superconductor/ferromagnet (S/F) interfaces play a crucial role in realizing dissipation-less spin-based logic and memory technologies, such as triplet-supercurrent spin-valves and ‘π’ Josephson junctions. Here we report the observation of an induced large magnetic moment at high-quality nitride S/F interfaces. Using polarized neutron reflectometry and DC SQUID measurements, we quantitatively determined the magnetization profile of the S/F bilayer and confirmed that the induced magnetic moment in the adjacent superconductor only exists below TC. Interestingly, the direction of the induced moment in the superconductors was unexpectedly parallel to that in the ferromagnet, which contrasts with earlier findings in S/F heterostructures based on metals or oxides. First-principles calculations verified that the unusual interfacial spin texture observed in our study was caused by the Heisenberg direct exchange coupling with constant J∼4.28 meV through d-orbital overlapping and severe charge transfer across the interfaces. Our work establishes an incisive experimental probe for understanding the magnetic proximity behavior at S/F interfaces and provides a prototype epitaxial ‘building block’ for superconducting spintronics.

Funder

National Key Basic Research Program of China

National Natural Science Foundation of China

CAS Project for Young Scientists in Basic Research

Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology

Chinese Academy of Sciences

China Postdoctoral Science Foundation

Special Research assistant of Chinese Academy of Sciences

Publisher

Oxford University Press (OUP)

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