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<p class="MsoNormal">This morning, join the Center for Emergent Materials and Condensed Matter Experiment communities for a special seminar:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Monday, November 13, 11:00AM in PRB 4138<o:p></o:p></p>
<p class="MsoNormal">Gleb Kakazei, IFIMUP-IN/Department of Physics and Astronomy, University of Porto, Porto, Portugal<o:p></o:p></p>
<p class="MsoNormal">“Vortices and skyrmions in nanopatterned magnetic structures”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Abstract<o:p></o:p></p>
<p class="MsoNormal">In the first part of the talk our new results on magnetization dynamics of vortex-state circular nanodots with relatively large radius/thickness aspect ratio 0.25 – 0.7 will be presented. They can be summarized as:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>A number of spin excitation modes were detected using broadband ferromagnetic resonance spectroscopy in the frequency range 0.5-6 GHz. The modes are found to be flexure oscillations of the vortex core string with n = 0,1,2… nodes along
the dot thickness, i.e. higher-order gyrotropic modes.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>It was established that above some thickness the intensity of more complicated n = 1 gyrotropic mode is unexpectedly higher than the one of n = 0 (uniform mode). The observed behavior is explained on the basis of the inhomogeneous vortex
mode phase profiles.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>With increase of dot thickness new azimuthal modes having curled structure at surfaces and radial nodes at dot central plane appear. Such complex structure of modes is a consequence of increasing thickness nonuniformity of effective
field. These “curled” modes, in contrast with common uniform along dot thickness azimuthal modes, have a significant difference in the intensity between clockwise and counterclockwise modes of the same type.<o:p></o:p></p>
<p class="MsoNormal">In the second part a new route to obtain skyrmions and their arrays in relatively thick (up to 5 nm) continuous films of 3d magnetic metals at room temperature and in the absence of external magnetic fields will be discussed. It is based
on the formation of strong vertical stray dipolar fields in the vicinity of film surface. Our micromagnetic simulations and analytical calculations demonstrate that this goal can be achieved by stacking two ferromagnetic subsystems - continuous film with in-plane
anisotropy (where skyrmions will be formed) and antidot array with perpendicular anisotropy (stray fields will be created at the hole edges). By adjusting magnetizations and thicknesses of the layers, interlayer exchange coupling strength and hole diameters,
different configurations for room temperature magnetic skyrmion arrays were obtained. Also, by introducing non-magnetic layer between two subsystems it is possible to create stable vortex-antivortex pairs with peculiar magnetic properties.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="line-height:13.5pt;background:white"><b><span style="font-size:9.0pt;color:#BB0000;background:white">Rachel A. H. Page </span></b><span style="font-size:9.0pt;color:#333333"><br>
Business Manager<br>
<b>The Ohio State University</b><br>
</span><span style="font-size:9.0pt;color:#BB0000;background:white">Center for Emergent Materials: an NSF MRSEC</span><span style="font-size:9.0pt;color:#333333"> <br>
2004 Physics Research Building | 191 W. Woodruff Ave., Columbus, OH 43210<br>
614-292-2368 Office<br>
</span><a href="mailto:page.257@osu.edu"><span style="font-size:9.0pt;color:blue;background:white">page.257@osu.edu</span></a><span style="font-size:9.0pt;color:#333333"> </span><a href="http://cem.osu.edu/"><span style="font-size:9.0pt;color:blue;background:white">cem.osu.edu</span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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