Inelastic Neutron Scattering Intensities of Ferromagnetic Cluster Spin Waves. Issue 8 (5th February 2019)

• Record Type: Journal Article
• Authors: Prša, Krunoslav; Waldmann, Oliver
• Other Names: Stride John A. guestEditor.; Queen Wendy L. guestEditor.; Romerosa Antonio guestEditor.
• Is Part Of: European journal of inorganic chemistry. Issue 8(2019)
• Page Start: 1128
• Page End: 1141
• Publication Date: 2019-02-05
• Subjects: Magnetic properties -- Single molecule magnets -- Spin waves -- Inelastic neutron scattering -- Four dimensional neutron scattering; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201801170
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : Inelastic neutron scattering (INS) is the key method for studying magnetic spectra. For ferromagnetic molecular nanomagnets the ferromagnetic cluster spin wave theory (FCSWT) exactly describes the low‐energy excitations from the ferromagnetic ground state. We provide a procedure starting from these molecular spin wave modes and ending with the experimentally observable INS spectra. The formulas for powder and single‐crystal spectra of isotropic and anisotropic ferromagnetic molecules are given. The INS interference pattern can be written in terms of "basis functions" fixed by the molecular geometry. We argue that this decomposition explicates the INS data when the spin wave modes are known and, vice versa, suggests a method to directly determine the quantum wavefunctions of the spin wave excitations based on the INS interference pattern. The calculation of INS observables is exemplified on three molecules: the Mn7 disc, the Mn10 supertetrahedron, and the Mn6 single molecule magnet. Abstract : Combining the ferromagnetic cluster spin‐wave excitations of the molecular nanomagnet with its molecular structure, one obtains the spin‐spin correlation functions and the 4D inelastic neutron scattering (INS) observables. We argue that the opposite procedure is also possible: based on the INS data, it is possible to retrieve the spin waves.