Ultrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiation
The X /Co 3 nm/ Y (where X , Y = Au, Pt) trilayers with as deposited in-plane magnetization alignment were irradiated with 30 keV Ga ^+ ions in the wide range of ion fluence. The samples were investigated by means of complementary techniques: magneto-optical magnetometry and spectroscopy (in the pho...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/abde6d |
| _version_ | 1797750245590827008 |
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| author | P Mazalski L Ohnoutek I Sveklo L Beran Z Kurant W Powroźnik A Wawro M O Liedke M Butterling A Wagner J Fassbender J Hamrle R Antoš V Kletecka M Veis A Maziewski |
| author_facet | P Mazalski L Ohnoutek I Sveklo L Beran Z Kurant W Powroźnik A Wawro M O Liedke M Butterling A Wagner J Fassbender J Hamrle R Antoš V Kletecka M Veis A Maziewski |
| author_sort | P Mazalski |
| collection | DOAJ |
| description | The X /Co 3 nm/ Y (where X , Y = Au, Pt) trilayers with as deposited in-plane magnetization alignment were irradiated with 30 keV Ga ^+ ions in the wide range of ion fluence. The samples were investigated by means of complementary techniques: magneto-optical magnetometry and spectroscopy (in the photon energy range from 1.2 eV to 4.5 eV), magnetic force microscopy, positron annihilation spectroscopy, x-ray diffraction and reflectivity. Difference in miscibility of interface atoms is clearly manifested in various intermixing extent at Co/Pt and Co/Au interfaces and consequently in magnetic properties of the irradiated trilayers. Low irradiation fluence (∼10 ^14 ions cm ^−2 ) leads to ∼1 nm interfaces broadening without visible surface etching for all samples, which is related with a distinct drop of magnetic anisotropy. However, the high irradiation fluence (∼5 × 10 ^15 ions cm ^−2 ) results in enhanced interface broadening and significant surface etching (∼5 nm) partially removing also Co atoms. Tensile strains (up to 0.5%) were developed in the cover layers. The tensile strain, layers intermixing and the creation of Co–Pt(Au) alloys with different composition formed by irradiation are correlated with the increase of magnetic anisotropy. Moreover it was observed that substitution of Au instead of Pt (as a cap or buffer layer) results in substantial increase of perpendicular magnetic anisotropy. Maximal increase of magnetooptical parameters was observed for Pt/Co/Pt layer. Irradiation induced changes of concentration profiles are revealed using magnetooptical spectra, x-ray reflectivity spectra and simulations with use of binary collision approximation. |
| first_indexed | 2024-03-12T16:29:51Z |
| format | Article |
| id | doaj.art-d3609960811e42f5ae3ec97ae056d1cb |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:29:51Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-d3609960811e42f5ae3ec97ae056d1cb2023-08-08T15:32:44ZengIOP PublishingNew Journal of Physics1367-26302021-01-0123202301510.1088/1367-2630/abde6dUltrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiationP Mazalski0https://orcid.org/0000-0002-7014-0901L Ohnoutek1I Sveklo2https://orcid.org/0000-0002-5548-1791L Beran3Z Kurant4https://orcid.org/0000-0003-0723-7310W Powroźnik5A Wawro6https://orcid.org/0000-0001-8972-9284M O Liedke7https://orcid.org/0000-0001-7933-7295M Butterling8A Wagner9J Fassbender10https://orcid.org/0000-0003-3893-9630J Hamrle11R Antoš12V Kletecka13M Veis14https://orcid.org/0000-0001-6170-7585A Maziewski15https://orcid.org/0000-0003-1154-8402Jerzy Haber Institute of Catalysis and Surface Chemistry of the Polish Academy of Sciences , Cracow, Poland; Faculty of Physics, University of Bialystok , Bialystok, PolandFaculty of Mathematics and Physics, Charles University in Prague , Prague 2, Czech RepublicFaculty of Physics, University of Bialystok , Bialystok, PolandFaculty of Mathematics and Physics, Charles University in Prague , Prague 2, Czech RepublicFaculty of Physics, University of Bialystok , Bialystok, PolandAGH University of Science and Technology , Department of Electronics, Cracow, PolandInstitute of Physics Polish Academy of Sciences , Warsaw, PolandInstitute of Radiation Physics Helmholtz-Zentrum Dresden-Rossendorf , Dresden, GermanyInstitute of Radiation Physics Helmholtz-Zentrum Dresden-Rossendorf , Dresden, GermanyInstitute of Radiation Physics Helmholtz-Zentrum Dresden-Rossendorf , Dresden, GermanyInstitute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-Rossendorf , Dresden, GermanyFaculty of Mathematics and Physics, Charles University in Prague , Prague 2, Czech RepublicFaculty of Mathematics and Physics, Charles University in Prague , Prague 2, Czech RepublicFaculty of Mathematics and Physics, Charles University in Prague , Prague 2, Czech RepublicFaculty of Mathematics and Physics, Charles University in Prague , Prague 2, Czech RepublicFaculty of Physics, University of Bialystok , Bialystok, PolandThe X /Co 3 nm/ Y (where X , Y = Au, Pt) trilayers with as deposited in-plane magnetization alignment were irradiated with 30 keV Ga ^+ ions in the wide range of ion fluence. The samples were investigated by means of complementary techniques: magneto-optical magnetometry and spectroscopy (in the photon energy range from 1.2 eV to 4.5 eV), magnetic force microscopy, positron annihilation spectroscopy, x-ray diffraction and reflectivity. Difference in miscibility of interface atoms is clearly manifested in various intermixing extent at Co/Pt and Co/Au interfaces and consequently in magnetic properties of the irradiated trilayers. Low irradiation fluence (∼10 ^14 ions cm ^−2 ) leads to ∼1 nm interfaces broadening without visible surface etching for all samples, which is related with a distinct drop of magnetic anisotropy. However, the high irradiation fluence (∼5 × 10 ^15 ions cm ^−2 ) results in enhanced interface broadening and significant surface etching (∼5 nm) partially removing also Co atoms. Tensile strains (up to 0.5%) were developed in the cover layers. The tensile strain, layers intermixing and the creation of Co–Pt(Au) alloys with different composition formed by irradiation are correlated with the increase of magnetic anisotropy. Moreover it was observed that substitution of Au instead of Pt (as a cap or buffer layer) results in substantial increase of perpendicular magnetic anisotropy. Maximal increase of magnetooptical parameters was observed for Pt/Co/Pt layer. Irradiation induced changes of concentration profiles are revealed using magnetooptical spectra, x-ray reflectivity spectra and simulations with use of binary collision approximation.https://doi.org/10.1088/1367-2630/abde6dperpendicular magnetic anisotropyion irradiationstructural propertiespositron annihilation spectroscopymolecular beam epitaxyimmiscible/miscible interfaces |
| spellingShingle | P Mazalski L Ohnoutek I Sveklo L Beran Z Kurant W Powroźnik A Wawro M O Liedke M Butterling A Wagner J Fassbender J Hamrle R Antoš V Kletecka M Veis A Maziewski Ultrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiation New Journal of Physics perpendicular magnetic anisotropy ion irradiation structural properties positron annihilation spectroscopy molecular beam epitaxy immiscible/miscible interfaces |
| title | Ultrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiation |
| title_full | Ultrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiation |
| title_fullStr | Ultrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiation |
| title_full_unstemmed | Ultrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiation |
| title_short | Ultrathin Co films with Pt and Au covers—magnetic and structural properties driven by Ga+ ion irradiation |
| title_sort | ultrathin co films with pt and au covers magnetic and structural properties driven by ga ion irradiation |
| topic | perpendicular magnetic anisotropy ion irradiation structural properties positron annihilation spectroscopy molecular beam epitaxy immiscible/miscible interfaces |
| url | https://doi.org/10.1088/1367-2630/abde6d |
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