Superparamagnetic clusters at room temperature, anomalous magnetic coercivity and spin-flop transition in novel dilute antiferromagnetic nanoparticles of La2Fe0.875Cr0.125GaO6
•Dilute AFM La2Fe0.875Cr0.125GaO6 nanoparticles were prepared by sol-gel technique.•Crystallize in orthorhombic structure with Pbnm space group.•The particle size ranges from 28 to 62 nm.•Presence of non-interacting SPM clusters at room temperature.•Coercivity exhibits a maximum value of 6.694 kOe a...
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| Veröffentlicht in: | Journal of magnetism and magnetic materials 2019-08, Vol.483, p.272-280 |
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| creator | Dhal, Ramchandra Neenu Lekshmi, P. Das, Dhruba Santhosh, P.N. |
| description | •Dilute AFM La2Fe0.875Cr0.125GaO6 nanoparticles were prepared by sol-gel technique.•Crystallize in orthorhombic structure with Pbnm space group.•The particle size ranges from 28 to 62 nm.•Presence of non-interacting SPM clusters at room temperature.•Coercivity exhibits a maximum value of 6.694 kOe at ∼138 K.•Exhibits competing DM interaction and strong uncompensated surface spin effects.
Magnetism at the nanoscale is intriguing, but that on the magnetic properties of a dilute antiferromagnetic (AFM) system is rarely studied. Presence of uncompensated spins at the lattice as well as on the nanoparticle surfaces could lead to interesting magnetic behaviour. We present the combined effect of reduction in particle size and dilution of exchange interactions on the magnetic properties of an AFM perovskite oxide. A dilute AFM compound, La2Fe0.875Cr0.125GaO6 nanoparticles (average particle size ∼ 44.5 (7) nm), has been synthesized where non-magnetic Ga-ions are introduced to interrupt the superexchange pathways. The compound crystallizes in orthorhombic structure with Pbnm space group, where Fe, Cr and Ga ions are distributed randomly in the B-site. DC magnetic studies show superparamagnetic behaviour at room temperature, spin-flop transition and a prominent hysteresis loop with sufficiently high coercivity around 6.69 kOe at ∼138 K. The analysis of thermoremanent and isothermoremanent magnetization curves reveal SPM behaviour at 300 K and 2-dimensional dilute antiferromagnetic in field like nature at 5 K. AC magnetic susceptibility analysis confirms the presence of non-interacting clusters having SPM behaviour with blocking temperature ∼280 K. Furthermore, temperature variation of coercivity shows a Gaussian nature, mainly associated with competing Dzyaloshinskii-Moriya interactions between disordered B-site ions along with strong uncompensated surface spin effects. |
| doi_str_mv | 10.1016/j.jmmm.2019.02.060 |
| format | Article |
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Magnetism at the nanoscale is intriguing, but that on the magnetic properties of a dilute antiferromagnetic (AFM) system is rarely studied. Presence of uncompensated spins at the lattice as well as on the nanoparticle surfaces could lead to interesting magnetic behaviour. We present the combined effect of reduction in particle size and dilution of exchange interactions on the magnetic properties of an AFM perovskite oxide. A dilute AFM compound, La2Fe0.875Cr0.125GaO6 nanoparticles (average particle size ∼ 44.5 (7) nm), has been synthesized where non-magnetic Ga-ions are introduced to interrupt the superexchange pathways. The compound crystallizes in orthorhombic structure with Pbnm space group, where Fe, Cr and Ga ions are distributed randomly in the B-site. DC magnetic studies show superparamagnetic behaviour at room temperature, spin-flop transition and a prominent hysteresis loop with sufficiently high coercivity around 6.69 kOe at ∼138 K. The analysis of thermoremanent and isothermoremanent magnetization curves reveal SPM behaviour at 300 K and 2-dimensional dilute antiferromagnetic in field like nature at 5 K. AC magnetic susceptibility analysis confirms the presence of non-interacting clusters having SPM behaviour with blocking temperature ∼280 K. Furthermore, temperature variation of coercivity shows a Gaussian nature, mainly associated with competing Dzyaloshinskii-Moriya interactions between disordered B-site ions along with strong uncompensated surface spin effects.</description><identifier>ISSN: 0304-8853</identifier><identifier>EISSN: 1873-4766</identifier><identifier>DOI: 10.1016/j.jmmm.2019.02.060</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Antiferromagnetism ; Clusters ; Coercivity ; Dilute Antiferromagnet ; Dilution ; Dzyaloshinskii-Moriya interaction ; Hysteresis loops ; Magnetic permeability ; Magnetic properties ; Magnetism ; Magnetization curves ; Magnetization reversal ; Nanoparticles ; Particle size ; Perovskites ; Room temperature ; Spin-flop transition ; Superparamagnetism</subject><ispartof>Journal of magnetism and magnetic materials, 2019-08, Vol.483, p.272-280</ispartof><rights>2019 Elsevier B.V.</rights><rights>Copyright Elsevier BV Aug 1, 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c328t-615e2c713af1505a67506e93318acd9d278ae0c123aaefd6c4fdb087046519473</citedby><cites>FETCH-LOGICAL-c328t-615e2c713af1505a67506e93318acd9d278ae0c123aaefd6c4fdb087046519473</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jmmm.2019.02.060$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3549,27923,27924,45994</link.rule.ids></links><search><creatorcontrib>Dhal, Ramchandra</creatorcontrib><creatorcontrib>Neenu Lekshmi, P.</creatorcontrib><creatorcontrib>Das, Dhruba</creatorcontrib><creatorcontrib>Santhosh, P.N.</creatorcontrib><title>Superparamagnetic clusters at room temperature, anomalous magnetic coercivity and spin-flop transition in novel dilute antiferromagnetic nanoparticles of La2Fe0.875Cr0.125GaO6</title><title>Journal of magnetism and magnetic materials</title><description>•Dilute AFM La2Fe0.875Cr0.125GaO6 nanoparticles were prepared by sol-gel technique.•Crystallize in orthorhombic structure with Pbnm space group.•The particle size ranges from 28 to 62 nm.•Presence of non-interacting SPM clusters at room temperature.•Coercivity exhibits a maximum value of 6.694 kOe at ∼138 K.•Exhibits competing DM interaction and strong uncompensated surface spin effects.
Magnetism at the nanoscale is intriguing, but that on the magnetic properties of a dilute antiferromagnetic (AFM) system is rarely studied. Presence of uncompensated spins at the lattice as well as on the nanoparticle surfaces could lead to interesting magnetic behaviour. We present the combined effect of reduction in particle size and dilution of exchange interactions on the magnetic properties of an AFM perovskite oxide. A dilute AFM compound, La2Fe0.875Cr0.125GaO6 nanoparticles (average particle size ∼ 44.5 (7) nm), has been synthesized where non-magnetic Ga-ions are introduced to interrupt the superexchange pathways. The compound crystallizes in orthorhombic structure with Pbnm space group, where Fe, Cr and Ga ions are distributed randomly in the B-site. DC magnetic studies show superparamagnetic behaviour at room temperature, spin-flop transition and a prominent hysteresis loop with sufficiently high coercivity around 6.69 kOe at ∼138 K. The analysis of thermoremanent and isothermoremanent magnetization curves reveal SPM behaviour at 300 K and 2-dimensional dilute antiferromagnetic in field like nature at 5 K. AC magnetic susceptibility analysis confirms the presence of non-interacting clusters having SPM behaviour with blocking temperature ∼280 K. Furthermore, temperature variation of coercivity shows a Gaussian nature, mainly associated with competing Dzyaloshinskii-Moriya interactions between disordered B-site ions along with strong uncompensated surface spin effects.</description><subject>Antiferromagnetism</subject><subject>Clusters</subject><subject>Coercivity</subject><subject>Dilute Antiferromagnet</subject><subject>Dilution</subject><subject>Dzyaloshinskii-Moriya interaction</subject><subject>Hysteresis loops</subject><subject>Magnetic permeability</subject><subject>Magnetic properties</subject><subject>Magnetism</subject><subject>Magnetization curves</subject><subject>Magnetization reversal</subject><subject>Nanoparticles</subject><subject>Particle size</subject><subject>Perovskites</subject><subject>Room temperature</subject><subject>Spin-flop transition</subject><subject>Superparamagnetism</subject><issn>0304-8853</issn><issn>1873-4766</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kcFq3DAQhkVpods0L9CToNfaGUmWrIVeytKkgYUc0p6FIo-LjC25kryQp-orVsuW9pbTDMz3_zPDT8gHBi0Dpm6mdlqWpeXA9i3wFhS8Ijume9F0vVKvyQ4EdI3WUrwl73KeAIB1Wu3I78dtxbTaZBf7M2Dxjrp5ywVTprbQFONCCy6VsWVL-InaEBc7xy3T_4KIyfmTL891OtC8-tCMc1xpSTZkX3wM1Aca4glnOvh5K1jB4kdMKf5zCdW53lHbGTONIz1afovQ6l4eUn2Tyzv7oN6TN6OdM17_rVfkx-3X74dvzfHh7v7w5dg4wXVpFJPIXc-EHZkEaVUvQeFeCKatG_YD77VFcIwLa3EclOvG4Ql0D52SbN_14op8vPiuKf7aMBczxS2FutJwrjqmGHBZKX6hXIo5JxzNmvxi07NhYM7BmMmcgzHnYAxwU4Opos8XEdb7Tx6Tyc5jcDj4hK6YIfqX5H8AZvyZ1w</recordid><startdate>20190801</startdate><enddate>20190801</enddate><creator>Dhal, Ramchandra</creator><creator>Neenu Lekshmi, P.</creator><creator>Das, Dhruba</creator><creator>Santhosh, P.N.</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20190801</creationdate><title>Superparamagnetic clusters at room temperature, anomalous magnetic coercivity and spin-flop transition in novel dilute antiferromagnetic nanoparticles of La2Fe0.875Cr0.125GaO6</title><author>Dhal, Ramchandra ; Neenu Lekshmi, P. ; Das, Dhruba ; Santhosh, P.N.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c328t-615e2c713af1505a67506e93318acd9d278ae0c123aaefd6c4fdb087046519473</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Antiferromagnetism</topic><topic>Clusters</topic><topic>Coercivity</topic><topic>Dilute Antiferromagnet</topic><topic>Dilution</topic><topic>Dzyaloshinskii-Moriya interaction</topic><topic>Hysteresis loops</topic><topic>Magnetic permeability</topic><topic>Magnetic properties</topic><topic>Magnetism</topic><topic>Magnetization curves</topic><topic>Magnetization reversal</topic><topic>Nanoparticles</topic><topic>Particle size</topic><topic>Perovskites</topic><topic>Room temperature</topic><topic>Spin-flop transition</topic><topic>Superparamagnetism</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dhal, Ramchandra</creatorcontrib><creatorcontrib>Neenu Lekshmi, P.</creatorcontrib><creatorcontrib>Das, Dhruba</creatorcontrib><creatorcontrib>Santhosh, P.N.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of magnetism and magnetic materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dhal, Ramchandra</au><au>Neenu Lekshmi, P.</au><au>Das, Dhruba</au><au>Santhosh, P.N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Superparamagnetic clusters at room temperature, anomalous magnetic coercivity and spin-flop transition in novel dilute antiferromagnetic nanoparticles of La2Fe0.875Cr0.125GaO6</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2019-08-01</date><risdate>2019</risdate><volume>483</volume><spage>272</spage><epage>280</epage><pages>272-280</pages><issn>0304-8853</issn><eissn>1873-4766</eissn><abstract>•Dilute AFM La2Fe0.875Cr0.125GaO6 nanoparticles were prepared by sol-gel technique.•Crystallize in orthorhombic structure with Pbnm space group.•The particle size ranges from 28 to 62 nm.•Presence of non-interacting SPM clusters at room temperature.•Coercivity exhibits a maximum value of 6.694 kOe at ∼138 K.•Exhibits competing DM interaction and strong uncompensated surface spin effects.
Magnetism at the nanoscale is intriguing, but that on the magnetic properties of a dilute antiferromagnetic (AFM) system is rarely studied. Presence of uncompensated spins at the lattice as well as on the nanoparticle surfaces could lead to interesting magnetic behaviour. We present the combined effect of reduction in particle size and dilution of exchange interactions on the magnetic properties of an AFM perovskite oxide. A dilute AFM compound, La2Fe0.875Cr0.125GaO6 nanoparticles (average particle size ∼ 44.5 (7) nm), has been synthesized where non-magnetic Ga-ions are introduced to interrupt the superexchange pathways. The compound crystallizes in orthorhombic structure with Pbnm space group, where Fe, Cr and Ga ions are distributed randomly in the B-site. DC magnetic studies show superparamagnetic behaviour at room temperature, spin-flop transition and a prominent hysteresis loop with sufficiently high coercivity around 6.69 kOe at ∼138 K. The analysis of thermoremanent and isothermoremanent magnetization curves reveal SPM behaviour at 300 K and 2-dimensional dilute antiferromagnetic in field like nature at 5 K. AC magnetic susceptibility analysis confirms the presence of non-interacting clusters having SPM behaviour with blocking temperature ∼280 K. Furthermore, temperature variation of coercivity shows a Gaussian nature, mainly associated with competing Dzyaloshinskii-Moriya interactions between disordered B-site ions along with strong uncompensated surface spin effects.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2019.02.060</doi><tpages>9</tpages></addata></record> |
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| subjects | Antiferromagnetism Clusters Coercivity Dilute Antiferromagnet Dilution Dzyaloshinskii-Moriya interaction Hysteresis loops Magnetic permeability Magnetic properties Magnetism Magnetization curves Magnetization reversal Nanoparticles Particle size Perovskites Room temperature Spin-flop transition Superparamagnetism |
| title | Superparamagnetic clusters at room temperature, anomalous magnetic coercivity and spin-flop transition in novel dilute antiferromagnetic nanoparticles of La2Fe0.875Cr0.125GaO6 |
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