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Magnetic Force Microscopy (MFM) Study of Remagnetization Effects in Patterned Ferromagnetic Nanodots
Joonyeon Chang,A. A. Fraerman,Suk Hee Han,Hi Jung Kim,S. A. Gusev,V. L. Mironov 한국자기학회 2005 Journal of Magnetics Vol.10 No.2
Periodic magnetic nanodot arrays were successfully produced on glass substrates by interference laser lithography and electron beam lithography methods. Magnetic force microscopy (MFM) observation was carried out on fabricated nanodot arrays. MFM tip induced magnetization effects were clearly observed in ferromagnetic elliptical nanodots varying in material and aspect ratio. Fe-Cr dots with a high aspect ratio show reversible switching of the single domain magnetization state. At the same time, Co nanomagnets with a low aspect ratio exhibit tip induced transitions between the single domain and the vortex state of magnetization. The simple nanolithography is potentially an efficient method for fabrication of patterned magnetic arrays.
Magnetization Behavior of Co Nanodot Array
Joonyeon Chang,B. A. Gribkov,HyungJun Kim,Hyuncheol Koo,Suk Hee Han,V. L. Mironov,A. A. Fraerman 한국자기학회 2007 Journal of Magnetics Vol.12 No.1
We performed magnetic force microscopy (MFM) observation on array of Co dots in order to understand magnetic state and magnetization behavior of submicron sized Co dots patterned on GaMnAs bridge. MFM observations showed the magnetization reversal and processes of local magnetization of individual ferromagnetic Co nanodots. Magnetic state of Co dots either single domain or vortex is dependent on geometrical size and thickness. Transition from single domain to vortex state can be realized with MFM tip assisted local field. Magnetization reversal process takes place through sequential reversal of individual dots. Localized inhomogeneous magnetic field can be manipulated by controlling magnetic state of individual Co dot in the array structure.
Microstructural Changes of Epitaxial Fe/MgO Layers Grown on InAs(001) Substrates
Kim, Kyung-Ho,Kim, Hyung-jun,Ahn, Jae-Pyung,Choi, Jun Woo,Han, Jun Hyun,Tamarany, Rizcky,Lee, Seung-Cheol,Won, Sung Ok,Chang, Joonyeon,Kim, Young Keun American Chemical Society 2011 Crystal Growth & Design Vol.11 No.7
<P>The microstructural evolution and the effect on in-plane magnetic properties of epitaxial Fe/MgO layers grown on InAs(001) substrates have been investigated as a function of MgO growth temperature. The Fe grows three-dimensional islands with two different in-plane textures along [010] and [11̅0] directions on the MgO layers grown below 200 °C in remarkable contrast to two-dimensional Fe layers on the MgO layers grown above 300 °C. As the MgO growth temperature increases, both tensile-strained MgO and the subsequent Fe are simultaneously relaxed, and the distribution of 45°-rotated Fe lattices with [010] texture becomes dominant. The experimental results imply that the microstructural evolution of the Fe is strongly influenced by the underlying misfit strain within the MgO layers grown at different temperatures. The two different epitaxial relationships of the Fe islands lead to no magnetic anisotropy, while the Fe layer with the single epitaxial relationship of Fe[010]//MgO[11̅0]//InAs[11̅0] shows cubic magnetic anisotropy.</P><P>In Fe/MgO/InAs structures, Fe morphology and the resulting in-plane magnetic anisotropy are found to be changed by the MgO growth temperature due to the underlying tensile strain within MgO layers. The Fe islands and Fe layers on the MgO layers grown below 200 °C and above 300 °C show no magnetic anisotropy and cubic anisotropy, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cgdefu/2011/cgdefu.2011.11.issue-7/cg200051k/production/images/medium/cg-2011-00051k_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cg200051k'>ACS Electronic Supporting Info</A></P>