Experiments on Spin 1/2, One Dimensional, Heisenberg        Ferromagnets
{'Code': '03070007', 'Directorate': {'Abbreviation': 'MPS', 'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'Abbreviation': 'DMR', 'LongName': 'Division Of Materials Research'}}
{'SignBlockName': 'David Nelson', 'PO_EMAI': None, 'PO_PHON': None}
Magnetic materials are of great importance in computer memories                 and magnetic recording devices.  It is not fully understood what                controls magnetic interactions, and hence the magnetic properties               of materials.  The present proposal is one of a number of efforts               to examine model systems in which different magnetic interactions               can be isolated, studied in detail and better understood.                       Systems have recently been synthesized which conform to the model               of a spin 1/2, one dimensional Heisenberg ferromagnet.  The goal                of the present proposal is to address aspects of the model that                 have implications for nonlinear phenomena, magnetic-structural                  correlations and dynamic properties.  To this end, there will be                a detailed study to observe the crossover from spin wave to bound               magnon domination of magnetic susceptibilities.  The dependence                 of the superexchange interaction on bond angle will also be                     studied by measuring the magnetic susceptibility of samples                     placed under uniaxial stress.  Other experiments will examine the               phase diagrams and the multicritical point of quasi-one-                        dimensional mixed metal systems showing spin glass behavior.
{'FirstName': 'John', 'LastName': 'Drumheller', 'PI_MID_INIT': 'E', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'John E Drumheller', 'EmailAddress': 'drumheller@physics.montana.edu', 'NSF_ID': '000429115', 'StartDate': '06/15/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Montana State University', 'CityName': 'BOZEMAN', 'ZipCode': '59717', 'PhoneNumber': '4069942381', 'StreetAddress': '216 MONTANA HALL', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Montana', 'StateCode': 'MT', 'CONGRESSDISTRICT': '00', 'CONGRESS_DISTRICT_ORG': 'MT00', 'ORG_UEI_NUM': 'EJ3UF7TK8RT5', 'ORG_LGL_BUS_NAME': 'MONTANA STATE UNIVERSITY', 'ORG_PRNT_UEI_NUM': 'HD5YDTPGA865'}
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[{'Code': '1762', 'Text': 'SOLID STATE & MATERIALS CHEMIS'}, {'Code': '9120', 'Text': 'CROSS-DIRECTORATE PROGRAMS'}]
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