I am not sure but my understanding is that studying hysteresis phenomena needs to phenomenological models and I doubt if it is possible to study directly this macroscopic phenomena by first principles calculations without any phenomenology. As far as I know husteresis is s macroscopic phenomena wich originates from domain structure of the system. For example in the case of ferromagnetic hysteresis, the magnetic domain structure of the system give rises to hysteresis effect. Hence I guess you have to develop or find a phenomenological model based on some physical parameters such as domain wall energy to be able to draw hysteresis loop. The physical parameters of phenomenological models could be calculated by direct first principles computations.<br>
<br>SJ Hashemifar<br><br>======================================<br>Seyed Javad Hashemifar<br>Physics Department, Isfahan University of Technology<br>84156-83111 Isfahan, Iran<br>Tel: +98 311 391 2375 Fax:+98 311 3912376<br>
Email: <a href="mailto:hashemifar@cc.iut.ac.ir">hashemifar@cc.iut.ac.ir</a><br>Homepage: <a href="http://hashemifar.iut.ac.ir">http://hashemifar.iut.ac.ir</a><br>---------------------------------------------------------------------------<br>
<br><br><div class="gmail_quote">On Thu, Jul 7, 2011 at 6:17 PM, Mahdi Mirnezhad <span dir="ltr"><<a href="http://mirnezhad.mm">mirnezhad.mm</a>@<a href="http://gmail.com">gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im">Dear Developers,<br>
I want to study the hysteresis loop by using the DFT calculation.<br>
<br>
</div>We want to draw a graph of residual stress (strain).<br>
<div class="im"><br>
DFT<br>
simply calculates the Ground State of the physical system, it is not<br>
involve the memory of system. Could any body introduce me a DFT or<br>
"DFT like" method for this kind of calculations?<br>
Thanks in advance<br>
<br>
<br>
Mahdi Mirnezhad<br>
MSc student of Mechanical engineering,<br>
Guilan University.<br>
<br>
<br>
</div><div><div></div><div class="h5">On 7/7/11, Gabriele Sclauzero <<a href="mailto:sclauzer@sissa.it">sclauzer@sissa.it</a>> wrote:<br>
> Il giorno 06/lug/2011, alle ore 23.39, Mahdi Mirnezhad ha scritto:<br>
><br>
>> Dear Developers,<br>
>> I want to study the hysteresis loop by using the DFT calculation.<br>
><br>
> Hysteresis loops can arise in several physics phenomena and in different<br>
> situations, so it is not clear to me what you are referring to.<br>
> Please make your question more specific, for instance by pointing to some<br>
> work in the scientific literature! Are you speaking about dynamics,<br>
> magnetism, other...?<br>
><br>
><br>
> GS<br>
><br>
>> DFT<br>
>> simply calculates the Ground State of the physical system, it is not<br>
>> involve the memory of system. Could any body introduce me a DFT or<br>
>> "DFT like" method for this kind of calculations?<br>
>> Thanks in advance<br>
>><br>
>> ----------------------------------------------------------------------------<br>
>> Mahdi Mirnezhad<br>
>> MSc student of Mechanical engineering,<br>
>> Guilan University.<br>
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><br>
><br>
> § Gabriele Sclauzero, EPFL SB ITP CSEA<br>
> PH H2 462, Station 3, CH-1015 Lausanne<br>
><br>
><br>
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