Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers
Self-assembled two-dimensional arrays of either 14 nm hcp-Co or 6 nm ε-Co particle components were treated by hydrogen plasma for various exposure times. A change of hysteretic sample behavior depending on the treatment duration is reported, which can be divided in two time scales: oxygen reduction...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Beilstein-Institut
2013-03-01
|
| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.4.16 |
| _version_ | 1818259973175508992 |
|---|---|
| author | Alexander Weddemann Judith Meyer Anna Regtmeier Irina Janzen Dieter Akemeier Andreas Hütten |
| author_facet | Alexander Weddemann Judith Meyer Anna Regtmeier Irina Janzen Dieter Akemeier Andreas Hütten |
| author_sort | Alexander Weddemann |
| collection | DOAJ |
| description | Self-assembled two-dimensional arrays of either 14 nm hcp-Co or 6 nm ε-Co particle components were treated by hydrogen plasma for various exposure times. A change of hysteretic sample behavior depending on the treatment duration is reported, which can be divided in two time scales: oxygen reduction increases the particle magnetization during the first 20 min, which is followed by an alteration of the magnetic response shape. The latter depends on the respective particle species. Based on the Landau–Lifshitz equations for a discrete set of magnetic moments, we propose a model that relates the change of the hysteresis loops to a dipole-driven ordering of the magnetocrystalline easy axes within the particle plane due to the high spatial aspect ratio of the system. |
| first_indexed | 2024-12-12T18:23:56Z |
| format | Article |
| id | doaj.art-33737ac52baf4a73b9dc9207a849cb8f |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-12T18:23:56Z |
| publishDate | 2013-03-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-33737ac52baf4a73b9dc9207a849cb8f2022-12-22T00:16:04ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862013-03-014116417210.3762/bjnano.4.162190-4286-4-16Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayersAlexander Weddemann0Judith Meyer1Anna Regtmeier2Irina Janzen3Dieter Akemeier4Andreas Hütten5Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USADepartment of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, PB 100131, 33501 Bielefeld, GermanyDepartment of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, PB 100131, 33501 Bielefeld, GermanyDepartment of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, PB 100131, 33501 Bielefeld, GermanyDepartment of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, PB 100131, 33501 Bielefeld, GermanyDepartment of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, PB 100131, 33501 Bielefeld, GermanySelf-assembled two-dimensional arrays of either 14 nm hcp-Co or 6 nm ε-Co particle components were treated by hydrogen plasma for various exposure times. A change of hysteretic sample behavior depending on the treatment duration is reported, which can be divided in two time scales: oxygen reduction increases the particle magnetization during the first 20 min, which is followed by an alteration of the magnetic response shape. The latter depends on the respective particle species. Based on the Landau–Lifshitz equations for a discrete set of magnetic moments, we propose a model that relates the change of the hysteresis loops to a dipole-driven ordering of the magnetocrystalline easy axes within the particle plane due to the high spatial aspect ratio of the system.https://doi.org/10.3762/bjnano.4.16dipolar particle couplingmagnetic nanoparticlesmagnetocrystalline anisotropymonolayers |
| spellingShingle | Alexander Weddemann Judith Meyer Anna Regtmeier Irina Janzen Dieter Akemeier Andreas Hütten Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers Beilstein Journal of Nanotechnology dipolar particle coupling magnetic nanoparticles magnetocrystalline anisotropy monolayers |
| title | Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers |
| title_full | Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers |
| title_fullStr | Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers |
| title_full_unstemmed | Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers |
| title_short | Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers |
| title_sort | hydrogen plasma induced magnetocrystalline anisotropy ordering in self assembled magnetic nanoparticle monolayers |
| topic | dipolar particle coupling magnetic nanoparticles magnetocrystalline anisotropy monolayers |
| url | https://doi.org/10.3762/bjnano.4.16 |
| work_keys_str_mv | AT alexanderweddemann hydrogenplasmainducedmagnetocrystallineanisotropyorderinginselfassembledmagneticnanoparticlemonolayers AT judithmeyer hydrogenplasmainducedmagnetocrystallineanisotropyorderinginselfassembledmagneticnanoparticlemonolayers AT annaregtmeier hydrogenplasmainducedmagnetocrystallineanisotropyorderinginselfassembledmagneticnanoparticlemonolayers AT irinajanzen hydrogenplasmainducedmagnetocrystallineanisotropyorderinginselfassembledmagneticnanoparticlemonolayers AT dieterakemeier hydrogenplasmainducedmagnetocrystallineanisotropyorderinginselfassembledmagneticnanoparticlemonolayers AT andreashutten hydrogenplasmainducedmagnetocrystallineanisotropyorderinginselfassembledmagneticnanoparticlemonolayers |