title: Magnetic surfactants as molecular based-magnets with spin glass-like properties.
abstract: This paper reports the use of muon spin relaxation spectroscopy to study how the aggregation behavior of magnetic surfactants containing lanthanide counterions may be exploited to create spin glass-like materials. Surfactants provide a unique approach to building in randomness, frustration and competing interactions into magnetic materials without requiring a lattice of ordered magnetic species or intervening ligands and elements. We demonstrate that this magnetic behavior may also be manipulated via formation of micelles rather than simple dilution, as well as via design of surfactant molecular architecture. This somewhat unexpected result indicates the potential of using novel magnetic surfactants for the generation and tuning of molecular magnets.
authors.affiliation: Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Brown
authors.forename: Gregory N
authors.initials: GN
authors.lastname: Smith
authors.forename: Eduardo Padrón
authors.initials: EP
authors.lastname: Hernández
authors.forename: Craig
authors.initials: C
authors.lastname: James
authors.forename: Julian
authors.initials: J
authors.lastname: Eastoe
authors.forename: Wallace C
authors.initials: WC
authors.lastname: Nunes
authors.forename: Charles M
authors.initials: CM
authors.lastname: Settens
authors.forename: T Alan
authors.initials: TA
authors.lastname: Hatton
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Baker
mesh_terms: D005898:Glass / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry; D059346:Magnets / Q000737:chemistry*; D008823:Micelles; D009942:Organometallic Compounds / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D028581:Lanthanoid Series Elements; D008823:Micelles; D009942:Organometallic Compounds; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; C046112:didodecyldimethylammonium