Journal
ACS NANO
Volume 12, Issue 4, Pages 3442-3448Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00058
Keywords
magnetic configuration; magnetocrystalline anisotropy; electron holography; micromagnetic simulation; nanostructured BaFe12O19
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Funding
- National Natural Science Foundation of China [51571104, 11604130, 51601082, 51771085, 11274145]
- MOST International Cooperation Funds [2014DFA91340]
- Fundamental Research Funds for the Central Universities [lzujbky-2017-176, lzujbky-2017-177]
- Open Project of Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University [LZUMMM2017003]
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Discovering the effect of magnetic anisotropy on the magnetization configurations of magnetic nanomaterials is essential and significant for not only enriching the fundamental knowledge of magnetics but also facilitating the designs of desired magnetic nanostructures for diverse technological applications, such as data storage devices, spintronic devices, and magnetic nanosensors. Herein, we present a direct observation of magnetocrystalline anisotropy tuning magnetization configurations in uniaxial magnetic nanomaterials with hexagonal structure by means of three modeled samples. The magnetic configuration in polycrystalline BaFe12O19 nanoslice is a curling structure, revealing that the effect of magneto crystalline anisotropy in uniaxial magnetic nanomaterials can be broken by forming an amorphous structure or polycrystalline structure with tiny grains. Both single crystalline BaFe12O19 nanoslice and individual particles of single-particle-chain BaFe12O19 nanowire appear in a single domain state, revealing a dominant role of magnetocrystalline anisotropy in the magnetization configuration of uniaxial magnetic nanomaterials. These observations are further verified by micromagnetic computational simulations.
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