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Atomic origin of magnetic coupling of antiphase boundaries in magnetite thin films

Journal of Materials Science & Technology 2022年第12期107卷 92-99页

作者： Chunyang Gao Yixiao Jiang Tingting Yao Ang Tao Xuexi Yan Xiang Li Chunlin Chen Xiu-Liang Ma Hengqiang Ye Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesSchool of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China Ji Hua Laboratory Foshan 528200China

Revealing the magnetic coupling nature of boundary defects is crucial for in-depth understanding of the behavior and properties of magnetic materials and devices.Here,magnetite(i.e.,Fe_(3)O_(4))thin films were grown epitaxially on(100)SrTiOsingle-crystal substrates by pulsed laser deposition.Atomic-scale scanning transmission electron microscopy characterizations reveal that three types of antiphase boundaries(APBs)are formed in the Fe_(3)O_(4)thin film.They are the(100)APB that is formed on the(100)plane with a crystal translation of(1/4)a[011^(-)],the typeⅠand typeⅡ(110)APBs that are both formed on the(110)plane with the same crystal translation of(1/4)a[101]but different terminated atomic planes.The typeⅠ(110)APB is terminated at the atomic plane with mixed tetrahedral-and octahedral-sites Fe atoms,the typeⅡ(110)APB is terminated at the octahedral-site Fe plane.First-principles calculations reveal that the(100)APB and the typeⅠ(110)APB tend to form the ferromagnetic coupling that will not decrease the spin polarization of Fe_(3)O_(4)films,while the typeⅡ(110)APB prefers to form the antiferromagnetic coupling that will degrade the magnetic properties.The magnetic coupling modes of the APBs are closely related to the Fe-O-Fe bond angles across the boundaries.

关键词： Fe_(3)O_(4) Transmission electron microscopy antiphase boundary Magnetic coupling First-principles calculations

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THE INVESTIGATION OF KINETICS OF HIGH-TEMPERATURE STRUCTURE TRANSFORMATION OF HOMOPHASES AND HETEROPHASES MATERIALS

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 551-556页

作者： M.D. Starostenkov, E. V.Kozlov, O. V. Andruhova, N. V. Lomskikh, N.M. Gurova and A. V. Borissov 1) General Physics Department, ASTU, Lenin St. 46, Barnaul, 656099, Russia 2) Physics Department, TSABU, Solyanaya Sq., 2, Tomsk, 634003, Russia

The kinetics of internal boundaries relaxation: antiphase domain boundaries and interphase boundaries-in the conditions of high-temperature annealing and the structure transformations are investigated in homophase and heterophase systems. Homophase systems look like ordered binary alloy and include antiphase domain boundaries of various orientation. Clear components border on ordered alloy in heterophase systems and two processes take place simultaneously here-disordering of binary alloy and solution in ordered phase of clear component. Computer experiment is realized in the sphere of temperatures close to the temperature of order-disorder phase transition in the limits of two-dimensional model of atom diffusion at the vacant knots of crystal lattics.

关键词： computer simulation phase order-disorder transition antiphase boundary interphase boundary diffusion

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