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Atomic Structure and Electron Magnetic Circular Dichroism of Individual Rock Salt Structure Antiphase Boundaries in Spinel Ferrites
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- Li, Zhuo (författare)
- Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Natl Ctr Electron Microscopy Beijing,Key Lab Adv, Beijing 100084, Peoples R China.;City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Tat Chee Ave, Hong Kong 999077, Peoples R China.;City Univ Hong Kong, Shenzhen Futian Res Inst, Shenzhen 518048, Peoples R China.;City Univ Hong Kong, Shenzhen Res Inst, Nanomfg Lab NML, Shenzhen 518057, Peoples R China.
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- Lu, Jinlian (författare)
- Fudan Univ, Key Lab Computat Phys Sci, Minist Educ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China.;Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China.;Yancheng Inst Technol, Dept Phys, Yancheng 224051, Peoples R China.;Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52425 Julich, Germany.
- Jin, Lei (författare)
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- Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Natl Ctr Electron Microscopy Beijing,Key Lab Adv, Beijing 100084, Peoples R China;City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Tat Chee Ave, Hong Kong 999077, Peoples R China.;City Univ Hong Kong, Shenzhen Futian Res Inst, Shenzhen 518048, Peoples R China.;City Univ Hong Kong, Shenzhen Res Inst, Nanomfg Lab NML, Shenzhen 518057, Peoples R China. Fudan Univ, Key Lab Computat Phys Sci, Minist Educ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China.;Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China.;Yancheng Inst Technol, Dept Phys, Yancheng 224051, Peoples R China.;Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52425 Julich, Germany. (creator_code:org_t)
- 2021-03-17
- 2021
- Engelska.
- Ingår i: Advanced Functional Materials. - : John Wiley & Sons. - 1616-301X .- 1616-3028. ; 31:21
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Spinel ferrites are an important class of materials, whose magnetic properties are of interest for industrial applications. The antiphase boundaries (APBs) that are commonly observed in spinel ferrite films can hinder their applications in spintronic devices and sensors, as a result of their influence on magnetic degradation and magnetoresistance of the materials. However, it is challenging to correlate magnetic properties with atomic structure in individual APBs due to the limited spatial resolution of most magnetic imaging techniques. Here, aberration-corrected scanning transmission electron microscopy and electron energy-loss magnetic chiral dichroism are used to measure the atomic structure and electron magnetic circular dichroism (EMCD) of a single APB in NiFe2O4 that takes the form of a rock salt structure interlayer and is associated with a crystal translation of (1/4)a[011]. First principles density functional theory calculations are used to confirm that this specific APB introduces antiferromagnetic coupling and a significant decrease in the magnitude of the magnetic moments, which is consistent with an observed decrease in EMCD signal at the APB. The results provide new insight into the physical origins of magnetic coupling at an individual defect on the atomic scale.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- antiphase boundary
- atomic defect structure
- electron magnetic circular dichroism
- first principles calculations
- spinel ferrites
- transmission electron microscopy
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