FYP 2 - EPORTFOLIO 1
For the past few weeks, I have tried to get results with the info I had obtained from the forum. I did many try and error since im still in research to figure it out. At first, I was determined to get the results of AGNR. But when I kept getting the wrong results, I decided to stop. I think I need to find it using ZGNR first as the paper itself is using ZGNR.
When I don’t understand, I tried asking at the forum. Some of my questions had been answered by the expertise but some don’t. However, the answer given was not directly solved my questions. Mostly they helped me by giving tips or hint.
Most papers I read talked about ferromagnetic or anti-ferromagnetic. The thing is the paper that I referred to, didn’t mention anything about ferromagnetic. From this link, https://www.doitpoms.ac.uk/tlplib/ferromagnetic/printall.php, as can be seen from the periodic table, the elements that under ferromagnetic are Ni, Fe, and Co. Right now, both of my electrodes are only carbon and hydrogen. Im deeply confused. I once asked in the forum about how to set the magnetization of the electrodes. The expertise said that "it can be set using initial state" and he also gave the link of the tutorials, https://docs.quantumatk.com/tutorials/fe_mgo_fe/fe_mgo_fe.html and https://docs.quantumatk.com/tutorials/transmission_atomic_chain/transmission_atomic_chain.html.
Not only that, but I also asked what is the difference between magnetic configurations with parallel/anti-paralell. The expertise said "materials can be magnetic or non-magnetic at particular temperatures, e.g., Fe is ferromagnetic below the Curie temperature, and paramagnetic above it. There are many different magnetic configurations, antiferromagnetic, ferrimagnetic and so on. You may consult some textbook on that. Here is some book you can look into, Electrodynamics of Continuous Media
Authors: L. D. Landau, L. P. Pitaevskii, E.M. Lifshitz ". He then also said, "the parallel/anti-parallel magnetic configurations of GMR devices is just the same magnetic material (used for metal electrodes) with 2 different relative orientations (parallel / antiparallel) of magnetization vector in the 2 magnetic electrodes".
He helped me by sharing the textbook that I can refer to. Sadly, I still don’t understand and how to relate it. On 10/3/2020 i met Dr. Zaharah, she gives permission that i can email the owner of the paper that I referred to, https://doi.org/10.1063/1.3562320. Currently, im still waiting for the latest email by him. Hopefully, he can help me.