Talk:Single-molecule magnet

Wiki Education Foundation-supported course assignment

This article was the subject of a Wiki Education Foundation-supported course assignment, between 20 August 2020 and 23 November 2020. Further details are available on the course page. Student editor(s): Izapelka, Luthyc. Peer reviewers: Proelofsen, Gblair13.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 09:24, 17 January 2022 (UTC)

Merge proposal - 2007 - rejected

Speedy merge proposal regarding Molecule based magnets: Wiki already has Single-molecule magnet V8rik 17:01, 4 December 2007 (UTC)

Molecule based magnets are not single molecule magnets; they're still extended networks of molecules. The two are not equivalent and should not be merged (or, if merged, SMM should be a subcategory of molecule-based magnets, not the other way around). Thatjenn (talk) 23:42, 5 December 2007 (UTC)

Copyedit tag

• Please elaborate on the need for this tag, article is in good shape. What needs to be changed and who will do the work (remember for every 20 people adding tags there is just one doing actual editing) V8rik (talk) 19:49, 6 April 2008 (UTC)

It could use both section breaks and a general clean-up that made an attempt at a non-specialist presentation before dipping into jargon. Phil Sandifer (talk) 19:51, 6 April 2008 (UTC)

I can see that there is content, but its all in the introduction. We can start out with an introduction, the next section can be the background or explanation part. Then we can have that part on history where David Hendrickson comes in. Then the maths comes in $\ U=S^{2}|D|\,$. Then the measurements part. Then an application section where the building blocks for a quantum computer comes in and maybe the part about the record magnetization? And perhaps we can have some pictures of such materials in real-world applications or diagrams to visualize how a high spin ground state, high zero-field-splitting and have negligible magnetic interaction between molecules, magnet looks like.

And that maths formula will need an in-text citation to verify its source Venny85 20:25, 6 April 2008 (UTC)

wow, the article looks alot neater and has pictures to support its explanations and applications. The copyedit tag has already been removed. I feel this article now meets a better assessment. Thx guys! Venny85 12:46, 7 April 2008 (UTC)

I love doing research. But we still need a topic expert and a quality word-smith to look at it. WAS 4.250 (talk) 14:34, 7 April 2008 (UTC)

ok, Topic expert tag placed! Venny85 16:01, 7 April 2008 (UTC)

Calculation question

How is magnetic field strenght or magnetic field density calcualted in such structures (B and H), for example like in rod magnets? What parameters are needed if it is known molecule - or what equation connects spin S in shells that contribute to ferromagnetic effect to magnetic field strenght or magnetic field density at macroscopic level? —Preceding unsigned comment added by 193.2.9.35 (talk) 11:58, 13 October 2008 (UTC)

The spins of the metal-ions can be coupled via the organic ligands in 2 ways: anti-ferromagnetic or ferromagnetic. The giant spin (U = S^2 |D| uses the giant spin model) of a SMM and the coupling parameters (S=10 for Mn12ac) are determined experimentally. This can be done by SQUID-measurements: temperature dependence and fit with an Heisenberg Hamiltonian gives coupling parameters and S; Saturation value of the field dependence at low T corresponds to S. For all those measurements you use macroscopic samples (powder or single-crystalline (->if u plan to determine D)). A SMM can be intermolecular coupled but it is not necessary for slow magnetization relaxation - for a "real" quantum computer intermolecular coupling is even necessary. I will expand this article in the next two months. Hollyev (talk) 16:32, 7 December 2009 (UTC)

Thanks Hollyev for at least partly guiding me to this difficult subject. I've read many books and articles on molecular magnetism since I posted the above question in October last year, but it still remains difficult subject for the research I'm doing even if I have advanced knowledge in physics. One of the things many people will need is simplified explanation on how to obtain magnetic field strenght and density figures in classical way for various nanomagnetic structures, since those are important for further ideas in nanotech. So far, there are few articles out there covering coercive field SQUID measurements of powders, but that's still far away from getting actual magnetic field for each molecule of some powder. There was significant research done on this in Sweden and NIST in US. Regards.. —Preceding unsigned comment added by 193.2.9.35 (talk) 17:23, 9 December 2009 (UTC)

Actinium or Acetate????

Under "Types" you use "Ac" in the chemical formula. Is actinium actually in there???? I think you shouldn't abbreviate acetates in this manner since it stands for something else!!!! —Preceding unsigned comment added by 97.115.115.241 (talk) 01:31, 10 April 2011 (UTC)

Surely acetate. Materialscientist (talk) 01:44, 10 April 2011 (UTC)

Ac is a commonly used abbreviation for acetate in coordination chemistry. There is definitely no actinium in Mn12. — Preceding unsigned comment added by PhenolicOxime (talk • contribs) 11:30, 13 April 2017 (UTC)

New SSMs not talked about

There are some dimetallic lanthanide complexes (J. Am. Chem. Soc. 2011, 133, 14236–14239) that has blocking temp of 14K. There is another dysprosium analog with 8 K. These are now the highest and second highest temp SMMs. Should be worth mentioning, somewhere. — Preceding unsigned comment added by 169.234.215.251 (talk) 09:27, 24 November 2013 (UTC)

Possible applications at higher temperatures

What other possible applications apart from the data storage (& quantum computing and MRI) suggested in [1], and should we clarify that almost all existing work is at liquid helium temperatures, and mention the new results at -213°C  ?
Is blocking temp the temp at which mag' hysteresis can be demonstrated ? - Rod57 (talk) 13:35, 6 September 2017 (UTC)

Where to discuss single-atom magnets

Since we don't have a single-atom magnet article we could start with a section here ? Multiple approaches, eg EPFL April 2016,IBM March 2017. Single atoms (eg in crystal lattices) rather than in molecules. - Rod57 (talk) 08:17, 12 October 2018 (UTC)

Free (AGPL-3.0) source for plots

This dashboard for Single Ion Magnet DAta VISualisation (licensed under the AGPL-3.0) allows the production of scatter plots, box plots and bar charts as vectorial PDF files. Some may be useful for illustration e.g. how the distribution of reported Ueff values has evolved since 2003, or the relation between Ueff and tau0.

Review article on quantum applications

This recent review is already well cited and in a top journal:

• Moreno-Pineda, Eufemio; Wernsdorfer, Wolfgang (September 2021). "Measuring molecular magnets for quantum technologies". Nature Reviews Physics. 3 (9): 645–659. doi:10.1038/s42254-021-00340-3. ISSN 2522-5820.

Johnjbarton (talk) 21:09, 16 May 2024 (UTC)