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<p class="MsoPlainText"><span style="font-size:11.0pt">Please take note of Colloquium taking place today, Tuesday, March 6, 2012 at 4:00 PM in The Robert Smith Seminar Room. There will be a reception in the Atrium at 3:45 PM. Details concerning the talk are
as follows:<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Speaker: Xavi Marti – Charles University, Prague<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Date: Tuesday, March 6, 2012<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Time: 4:00 PM<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Place: The Robert Smith Seminar Room<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Title: The road towards antiferromagnetic semiconductors<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Abstract: <o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<span style="font-family:"Georgia","serif"">In 1936, a 21</span>$B!>(B<span style="font-family:"Georgia","serif"">year old student wrote: "</span><i><span style="font-family:"Georgia","serif"">In the circuits of complex electrical systems it is frequently necessary
to make intrincate interconnections of relays and switches</span></i><span style="font-family:"Georgia","serif"">". After showing how to simplify</span><i><span style="font-family:"Georgia","serif""><o:p></o:p></span></i></p>
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<span style="font-family:"Georgia","serif"">them, he concluded: "</span><i><span style="font-family:"Georgia","serif"">It is possible to perform
</span></i><span style="font-family:"Georgia","serif"">[any] </span><i><span style="font-family:"Georgia","serif"">complex functions by means of such circuits</span></i><span style="font-family:"Georgia","serif"">". [1]
<o:p></o:p></span></p>
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<span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
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<span style="font-family:"Georgia","serif"">In 1947, Bell Labs announced a </span>
<i><span style="font-family:"Georgia","serif"">compact </span></i><span style="font-family:"Georgia","serif"">electrical</span>$B!>(B<span style="font-family:"Georgia","serif"">in electrical</span>$B!>(B<span style="font-family:"Georgia","serif"">out switch based on
semiconductors </span>$B!>(B<span style="font-family:"Georgia","serif""><o:p></o:p></span></p>
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<span style="font-family:"Georgia","serif"">the transistor. Recall that virtually any
</span><i><span style="font-family:"Georgia","serif"">experience </span></i><span style="font-family:"Georgia","serif"">that surrounds us can be translated from/to electrical signals: light, sound, pressure (displacement), information, ... as well as transmitted
long<o:p></o:p></span></p>
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<span style="font-family:"Georgia","serif"">distances. It was a matter of time to fabricate any
</span><i><span style="font-family:"Georgia","serif"">compact </span></i><span style="font-family:"Georgia","serif"">machine with any purpose.
<o:p></o:p></span></p>
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<span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
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<span style="font-family:"Georgia","serif"">But the main character, the electron, has "spin". The marriage of charge and spin in metals, the socalled giant magnetoresistance, led to an improvement in data storage. But by using semiconductors there may be yet
the possibility to edit the functions that process the data. Recall that, in our brains, both our data and functions change by re</span>$B!>(B<span style="font-family:"Georgia","serif"">arranging our
</span><i><span style="font-family:"Georgia","serif"">electrical switches </span>
</i><span style="font-family:"Georgia","serif"">(neurons). <o:p></o:p></span></p>
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<span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
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<span style="font-family:"Georgia","serif"">In the last decade, spin</span>$B!>(B<span style="font-family:"Georgia","serif"">semiconductor</span>$B!>(B<span style="font-family:"Georgia","serif"">based switches have been developed using ferromagnets but, unfortunately,
operating below room temperature. In 45 minutes, we will discuss the alternatives</span><span style="font-family:"Georgia","serif"">
</span><span style="font-family:"Georgia","serif"">with antiferromagnetic semicondcutors. Our recent work comprises the demonstration that materials for room temperature operation can be prepared [2] and the manipulation of antiferrromagnetic</span>$B!>(B<span style="font-family:"Georgia","serif"">based
switches [3].<o:p></o:p></span></p>
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<span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
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<span style="font-family:"Georgia","serif"">[1] Claude Shannon, Master thesis, "A symbolic analysis of relay and switching circuits".<o:p></o:p></span></p>
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<span style="font-family:"Georgia","serif"">[2] T. Jungwirth, et al., Phys. Rev. B 83, 035321 (2011)<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">[3] B</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">$B!>(B</span><span style="font-size:11.0pt">G. Park, et al., Nature Materials 10, 347–351 (2011)</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">The website for the Colloquium is
<a href="https://www.physics.ohio-state.edu/news/colloquium.php">https://www.physics.ohio-state.edu/news/colloquium.php</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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