Investigation of the magnetization reversal of a magnetic dot array of Co/Pt multilayers
Source abstract
Abstract
The magnetization reversal behavior of a dot array consisting of Co/Pt multilayers with perpendicular magnetic anisotropy was investigated. The size of the dots was varied from 200 nm down to 40 nm, while keeping the filling factor constant at about 0.16. The structural properties were determined by scanning electron microscopy, whereas the magnetic investigation was performed using SQUID and MFM techniques. It was observed that the dot size has a severe impact on the magnetization reversal mechanism where only the smallest dots with a size of 40 nm are found to be in a magnetic single-domain state. Moreover, the patterning process leads to a degradation of the multilayer, leading to a reduction of the switching field and an increase of the switching field distribution with decreasing dot size. In addition, micromagnetic simulations were performed to understand the magnetization reversal mechanism in more detail.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Applications · Magnetic Properties of Alloys
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (16)
Show source-provided references
1. Adeyeye AO, Singh N (2008) Large area patterned magnetic nanostructures. J Phys D 41:15300110.1088/0022-3727/41/15/153001 ↗
2. Aharoni A (1997) Angular dependence of nucleation by curling in a prolate spheroid. J Appl Phys 82:1281–128810.1063/1.365899 ↗
3. Frei EH, Shtrikman S, Treves D (1957) Critical size and nucleation field of ideal ferromagnetic particles. Phys Rev 106:446–45510.1103/PhysRev.106.446 ↗
4. Ishii Y (1991) Magnetization curling in an infinite cylinder with a uniaxial magnetocrystalline anisotropy. J Appl Phys 70:3765–377010.1063/1.349231 ↗
5. Krone P, Makarov D, Schrefl T, Albrecht M (2009) Effect of the anisotropy distribution on the coercive field and switching field distribution of bit patterned media. J Appl Phys 106:10391310.1063/1.3260240 ↗
6. Krone P, Makarov D, Albrecht M, Schrefl T, Suess D (2010) Magnetization reversal processes of single nanomagnets and their energy barrier. J Magn Magn Mater 322:3771–377610.1016/j.jmmm.2010.07.041 ↗
7. Makarov D, Tibus S, Rettner CT, Thomson T, Terris BD, Schrefl T, Albrecht M (2008) Magnetic strip patterns induced by focused ion beam irradiation. J Appl Phys 103:06391510.1063/1.2894587 ↗
8. Piramanayagam SN, Srinivasan K (2009) Recording media research for future hard disk drives. J Magn Magn Mater 321:485–49410.1016/j.jmmm.2008.05.007 ↗
9. Rave W, Fabian K, Hubert A (1998) Magnetic states of small cubic particles with uniaxial anisotropy. J Magn Magn Mater 190:332–34810.1016/S0304-8853(98)00328-X ↗
10. Rettner CT, Anders S, Thomson T, Albrecht M, Ikeda Y, Best ME, Terris BD (2002) Magnetic characterization and recording properties of patterned Co70Cr18Pt12 perpendicular media. IEEE Trans Magn 38:1725–173010.1109/TMAG.2002.1017763 ↗
11. Schabes ME, Bertram HN (1988) Magnetization processes in ferromagnetic cubes. J Appl Phys 64:1347–135810.1063/1.341858 ↗
12. Schrefl T, Schabes ME, Suess D, Ertl O, Kirschner M, Dorfbauer F, Hrkac G, Fidler J (2005) Partitioning of the perpendicular write field into head and SUL contributions. IEEE Trans Magn 41:3064–306610.1109/TMAG.2005.855227 ↗
13. Skomski R (2003) Nanomagnetics. J Phys Condens Matter 15:R841–R89610.1088/0953-8984/15/20/202 ↗
14. Stoner EC (1948) A mechanism of magnetic hysteresis in heterogeneous alloys. Trans R Soc A240:599–64210.1098/rsta.1948.0007 ↗
15. Terris BD (2009) Fabrication challenges for patterned recording media. J Magn Magn Mater 321:512–51710.1016/j.jmmm.2008.05.046 ↗
16. Weller D, Brändle H, Gorman G, Lin C, Notarys H (1992) Magnetic and magneto optical properties of cobalt platinum alloys with perpendicular magnetic anisotropy. Appl Phys Lett 61:2726–272910.1063/1.108074 ↗