Self-organized magnetic assemblies of (001) oriented FePt nanoparticles with SiO2 additive
- 1. Institute of Physics, Academia Sinica, Taipei 115, Taiwan (China)
- 2. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan (China)
- 3. Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan (China)
- 4. Department of Materials Engineering, Tatung University, Taipei 104, Taiwan (China)
Description
Well-isolated FePt(001) nanoparticles embedded in an amorphous SiO2 matrix have been successfully fabricated via a molecular-beam epitaxy technique on MgO(001) single-crystal substrates via the introduction of a SiO2 intermediate layer into the FePt film structures, the critical thickness of which is 10 nm. The formation of two-dimensional magnetic assemblies of ordered FePt(001) nanoparticles with an average size of about 6 nm was directly obtained with this process at only 400 deg. C due to the interpenetration of SiO2 which has a lower surface energy. Studies of angular-dependent coercivity show a tendency of a domain-wall motion shift towards rotation of reverse-domain type upon insertion of the SiO2 into the FePt structures, and domain rotation is enhanced, leading to a decoupling of intergrain interaction, as identified with δM measurement
Additional details
Identifiers
- DOI
- 10.1088/0957-4484/18/33/335603;
- PII
- S0957-4484(07)49830-0;
Publishing Information
- Journal Title
- Nanotechnology (Print)
- Journal Volume
- 18
- Journal Issue
- 33
- Journal Page Range
- p. 335603
- ISSN
- 0957-4484
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 39040709
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ADDITIVES; COERCIVE FORCE; CRYSTAL GROWTH; FILMS; IRON ALLOYS; LAYERS; MAGNESIUM OXIDES; MOLECULAR BEAM EPITAXY; MONOCRYSTALS; NANOSTRUCTURES; PARTICLES; PLATINUM ALLOYS; SILICON OXIDES; SUBSTRATES; SURFACE ENERGY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ALLOYS; CHALCOGENIDES; CRYSTAL GROWTH METHODS; CRYSTALS; ENERGY; EPITAXY; FREE ENERGY; MAGNESIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PLATINUM METAL ALLOYS; SILICON COMPOUNDS; SURFACE PROPERTIES; TEMPERATURE RANGE; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT ALLOYS