{"id":{"repo_id":"soton","oai_identifier":"oai:eprints.soton.ac.uk:192469"},"canonical_url":"https://search.dev.ndltd.org/etd/soton/oai:eprints.soton.ac.uk:192469","repository":{"repo_id":"soton","name":"University of Southampton","base_url":"https://eprints.soton.ac.uk/cgi/oai2"},"display":{"title":"Two dimensional Langmuir-Blodgett magnets","abstract":"The susceptibility of quasi-two-dimensional magnets formed by the Langmuir-Blodgett deposition of manganese stearate on aluminium foil has been measured at several points between 20 K and 0.4 K. Large area samples of 101 and 11 layers were detected by a SQUID magnetometer. With the magnetic field parallel to the film we deduced an equivalent volume susceptibility of 6.4x10<sup>-3</sup> at 4.2 K. The signals from the multilayers were paramagnetic in nature and no evidence for a transition was found. Unfortunately the signal from a bilayer and monolayer were masked by contaminants on the substrate.<br/><br/>The magnetometer used a cold finger to which the sample was attached. This was then moved into the pick-up coil, which was a second order gradiometer capable of cancelling out the signal from the long (150 mm) substrates. The magnetometer was usefully capable of detecting a sample with a moment down to 5x10<sup>-11</sup> Am<sup>2</sup> but vibration noise restricted the magnetic field to below 10 mT,<br/><br/>New equations were developed to describe the magnetic signals from a cylindrical magnetised sample within a superconducting shield. They were developed for use on a micro-computer making it possible to simulate the signal from the sample.<br/><br/>The tt-A curves for Manganese stearate were also studied. The uncertainty in the measurement of tx using filter papers was studied and estimated to be 2%. The manganese stearate was observed to transfer by Y and forced-Z type dipping.","abstract_html":"The susceptibility of quasi-two-dimensional magnets formed by the Langmuir-Blodgett deposition of manganese stearate on aluminium foil has been measured at several points between 20 K and 0.4 K. Large area samples of 101 and 11 layers were detected by a SQUID magnetometer. With the magnetic field parallel to the film we deduced an equivalent volume susceptibility of 6.4x10&lt;sup&gt;-3&lt;/sup&gt; at 4.2 K. The signals from the multilayers were paramagnetic in nature and no evidence for a transition was found. Unfortunately the signal from a bilayer and monolayer were masked by contaminants on the substrate.&lt;br/&gt;&lt;br/&gt;The magnetometer used a cold finger to which the sample was attached. This was then moved into the pick-up coil, which was a second order gradiometer capable of cancelling out the signal from the long (150 mm) substrates. The magnetometer was usefully capable of detecting a sample with a moment down to 5x10&lt;sup&gt;-11&lt;/sup&gt; Am&lt;sup&gt;2&lt;/sup&gt; but vibration noise restricted the magnetic field to below 10 mT,&lt;br/&gt;&lt;br/&gt;New equations were developed to describe the magnetic signals from a cylindrical magnetised sample within a superconducting shield. They were developed for use on a micro-computer making it possible to simulate the signal from the sample.&lt;br/&gt;&lt;br/&gt;The tt-A curves for Manganese stearate were also studied. The uncertainty in the measurement of tx using filter papers was studied and estimated to be 2%. The manganese stearate was observed to transfer by Y and forced-Z type dipping.","abstract_has_math":false,"creators":["Head, David Ian"],"institution":"University of Southampton","degree_name":"Ph.D.","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Blott, B.","Melville, D."],"committee_chairs":[],"committee_members":[],"year":1988,"date_issued":"1988-12","date_published":"1988-12","updated_at":"2026-07-24T04:36:28Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Blott, B.","Melville, D."]},{"key":"dc:creator","label":"Author","values":["Head, David Ian"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1988-12"]},{"key":"dc:date.issued","label":"Date","values":["1988-12"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Physics & Astronomy (pre 2011 reorg)","Department of Physics"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Southampton"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://eprints.soton.ac.uk/192469/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Ph.D."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://eprints.soton.ac.uk/192469/1/89036228.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The susceptibility of quasi-two-dimensional magnets formed by the Langmuir-Blodgett deposition of manganese stearate on aluminium foil has been measured at several points between 20 K and 0.4 K. Large area samples of 101 and 11 layers were detected by a SQUID magnetometer. With the magnetic field parallel to the film we deduced an equivalent volume susceptibility of 6.4x10<sup>-3</sup> at 4.2 K. The signals from the multilayers were paramagnetic in nature and no evidence for a transition was found. Unfortunately the signal from a bilayer and monolayer were masked by contaminants on the substrate.<br/><br/>The magnetometer used a cold finger to which the sample was attached. This was then moved into the pick-up coil, which was a second order gradiometer capable of cancelling out the signal from the long (150 mm) substrates. The magnetometer was usefully capable of detecting a sample with a moment down to 5x10<sup>-11</sup> Am<sup>2</sup> but vibration noise restricted the magnetic field to below 10 mT,<br/><br/>New equations were developed to describe the magnetic signals from a cylindrical magnetised sample within a superconducting shield. They were developed for use on a micro-computer making it possible to simulate the signal from the sample.<br/><br/>The tt-A curves for Manganese stearate were also studied. The uncertainty in the measurement of tx using filter papers was studied and estimated to be 2%. The manganese stearate was observed to transfer by Y and forced-Z type dipping."]},{"key":"dc:format","label":"Dc Format","values":["text"]},{"key":"dc:title","label":"Title","values":["Two dimensional Langmuir-Blodgett magnets"]}]}],"canonical_facts":{"dc:contributor.advisor":["Blott, B.","Melville, D."],"dc:creator":["Head, David Ian"],"dc:date":["1988-12"],"dc:date.issued":["1988-12"],"dc:description.abstract":["The susceptibility of quasi-two-dimensional magnets formed by the Langmuir-Blodgett deposition of manganese stearate on aluminium foil has been measured at several points between 20 K and 0.4 K. Large area samples of 101 and 11 layers were detected by a SQUID magnetometer. With the magnetic field parallel to the film we deduced an equivalent volume susceptibility of 6.4x10<sup>-3</sup> at 4.2 K. The signals from the multilayers were paramagnetic in nature and no evidence for a transition was found. Unfortunately the signal from a bilayer and monolayer were masked by contaminants on the substrate.<br/><br/>The magnetometer used a cold finger to which the sample was attached. This was then moved into the pick-up coil, which was a second order gradiometer capable of cancelling out the signal from the long (150 mm) substrates. The magnetometer was usefully capable of detecting a sample with a moment down to 5x10<sup>-11</sup> Am<sup>2</sup> but vibration noise restricted the magnetic field to below 10 mT,<br/><br/>New equations were developed to describe the magnetic signals from a cylindrical magnetised sample within a superconducting shield. They were developed for use on a micro-computer making it possible to simulate the signal from the sample.<br/><br/>The tt-A curves for Manganese stearate were also studied. The uncertainty in the measurement of tx using filter papers was studied and estimated to be 2%. The manganese stearate was observed to transfer by Y and forced-Z type dipping."],"dc:format":["text"],"dc:identifier.uri":["https://eprints.soton.ac.uk/192469/1/89036228.pdf"],"dc:publisher.department":["Physics & Astronomy (pre 2011 reorg)","Department of Physics"],"dc:publisher.institution":["University of Southampton"],"dc:relation.isreferencedby":["https://eprints.soton.ac.uk/192469/"],"dc:title":["Two dimensional Langmuir-Blodgett magnets"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["Ph.D."]},"updated_at":"2026-07-24T04:36:28Z"}