Questions tagged [magnetism]
For questions about magnetic systems and materials
22
questions
4
votes
0answers
18 views
How to calculate the exchange matrix of a bilayer magentic system?
I have been using the Vampire atomistic simulation software for a while and it has a useful simulation for predicting the curie temperature. But in order to do that I need the exchange matrix of Co-...
8
votes
1answer
51 views
How to visualize MuMax3 shapes?
I'm new to micromagnetics and the finite difference method. The mumax3 software lets you create a variety of geometric shapes. I would like to create a core-shell particle to study magneto-electric ...
8
votes
0answers
39 views
How to predict new Half Metallic materials with higher degree of spin polarization?
Using DFT calculations, how one can predict the new half metallic materials with higher degree of spin polarization. I want to know the steps which have to be followed in prediction of new materials. ...
8
votes
1answer
66 views
How to do spin polarization calculations using Quantum ESPRESSO?
I am currently new to DFT calculations in Quantum ESPRESSO. Though, I have read some research papers for determining spin polarization and Half-metallicity in certain Heusler alloys. These research ...
10
votes
1answer
108 views
Predicting magnetic moment of a metal complex computationally
Recently, for entrance exams, I have been dealing with a lot of weird compounds. One of them is $\ce{K3[Mn(CN)6]}$.
The objective was to predict the magnetic moment of the above complex.
I predict ...
10
votes
2answers
403 views
When should spin polarized calculations be done?
Should the presence of a d block element in the unit cell mandate the need for performing spin-polarized calculations? I wanted to find out the DOS, PDOS, and the band structure. I'm new to DFT and I'...
10
votes
1answer
96 views
How to automatically plot atomic structures with magnetic moments?
I work with magnetic materials and I haven't found a way to automatically plot structures with their corresponding magnetic moments. For this specific project I am using VASP. I am trying to plot ...
11
votes
1answer
63 views
Spin density in systems with non-collinear magnetism using VASP
I have recently been working with non-collinear antiferromagnetic systems. I understand that, in order to obtain spin density, one must obtain the electron density in one configuration of spin and ...
15
votes
3answers
1k views
Magnetism and Topology
Can magnetism and topological insulating behavior coexist in a material? If yes, can someone refer to a recent work?
5
votes
1answer
64 views
What measured quantity can be associated to the value of the J parameter in the Heisengerg/Ising hamiltonians?
This question is related to other one here in the MatterModelingSE:
Is it possible to calculate/estimate the value of the J parameter to be used in the Heisengerg/Ising hamiltonians?
Here J is the ...
6
votes
0answers
73 views
Is it possible to calculate/estimate the value of the J parameter to be used in the Heisengerg/Ising hamiltonians?
Studying magnetic systems, two frequently used approximations are the Heisenberg and Ising models (a discussion about these approximations can be read here):
\begin{equation}
\tag{Heisenberg}
\hat{H}...
14
votes
1answer
76 views
How accurately are magnetic effects treated in *ab initio* methods?
I am a condensed matter theorist and I mostly use quantum Monte Carlo methods. I use models like the Heisenberg model, an represent an extreme simplification of real materials to just localized spin ...
4
votes
1answer
157 views
How is the material $\ce{\alpha-NaMnO2}$ pronounced? [closed]
I am a theoretical physicist, so I am not very familiar with chemical names. The material I am interested in is $\ce{\alpha-NaMnO2}$. Would that be pronounced alpha sodium manganese dioxide? Is it ...
12
votes
1answer
199 views
Is Heisenberg model or in its simplier form Ising model a good approximation to study magnetic systems?
Heisenberg model
$$\hat{H}=-\sum_{\langle i j\rangle}J\hat{S}_i\hat{S}_j$$
And in its simplified version, the Ising model
$$\hat{H}=-\sum_{\langle ij\rangle}J\hat{S}_i^z\hat{S}_j^z$$
are widely ...
22
votes
3answers
150 views
What are examples of materials that closely correspond to the Heisenberg model?
I use the antiferromagnetic Heisenberg model all the time:
$ H = J \sum \limits_{\langle i,j \rangle} \vec S_i \cdot \vec S_j$
What are some examples of materials that are well-described by this ...
12
votes
2answers
49 views
How does magnetic anisotropy cause stable long range magnetic ordering in quasi-one-dimensional solids?
According to Mermin-Wagner theorem ferro/antiferromagnetic ordering cannot occur in ideal one dimensional systems. However there exists quasi-one-dimensional ferromagnetic materials attributing its ...
16
votes
1answer
37 views
Does the thermal evolution of molecular structures critically affect the validity of the calculated magnetic anisotropy?
This is a particular aspect I'm interested in, from the more generic question
"Does the thermal evolution of chemical structures critically affect the validity of the calculated physical properties?". ...
15
votes
2answers
168 views
Is there any good review paper on the density matrix renormalization group (DMRG) method?
I would appreciate if someone could recommend me good review literature on the density matrix renormalization group (DMRG) method, especially for magnetic systems.
19
votes
1answer
177 views
Calculation of the relative energies in a Spin Crossover material
Spin Crossover (SCO) complexes are a particular type of molecular entities which are usually formed by a metal ion (general $\ce{Fe(II)}$ or $\ce{Co(III)}$) complexed by several ligands with donor N ...
13
votes
1answer
89 views
How to model phase transitions at critical regions in a magnetic system?
Is there any first principle method available to study phase transitions at the critical region for ferromagnetism (FM) or antiferromagnetism (AFM)?
17
votes
1answer
73 views
Best partial atomic charges estimate for crystal field purposes?
The estimates for partial atomic charges start with the very simple Mulliken analysis, which we all study in class, but which is known to be very limited. Beyond this, there is a range of ...
16
votes
1answer
88 views
How to evaluate spin exchange parameters of a magnetic material using DFT?
I think we have to calculate total energies using different FM, AFM configurations and solve a set of linear equations. How to arrive at the set of equations for any given structure?
An example from ...
