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Comparison of anomalous magnetic properties of non-collinear CoCr2O4 and NiCr2O4 nanoparticles
•Tc was high for CoCr2O4 nanoparticles as compared to NiCr2O4.•A high value of Hc was observed for NiCr2O4 nanoparticles.•Larger canted angle increases the Hc value of NiCr2O4 nanoparticles.•NiCr2O4 nanoparticles follow the Bloch’s law with high value of Bloch’s constant and exponent.•CoCr2O4 nanopa...
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| Published in: | Journal of magnetism and magnetic materials 2020-11, Vol.514, p.167225, Article 167225 |
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| container_title | Journal of magnetism and magnetic materials |
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| creator | Rasool, R. Zohaib Nadeem, K. Kamran, M. Zeb, F. Ahmad, Naman Mumtaz, M. |
| description | •Tc was high for CoCr2O4 nanoparticles as compared to NiCr2O4.•A high value of Hc was observed for NiCr2O4 nanoparticles.•Larger canted angle increases the Hc value of NiCr2O4 nanoparticles.•NiCr2O4 nanoparticles follow the Bloch’s law with high value of Bloch’s constant and exponent.•CoCr2O4 nanoparticles do not follow Bloch’s law predicted trend.
Temperature-dependent magnetic properties of cobalt chromite (CoCr2O4) and nickel chromite (NiCr2O4) nanoparticles (NPs) have been compared by using magnetic measurements. The average particle size of CoCr2O4 and NiCr2O4 NPs deduced from TEM images was found to be 48 and 46 nm, respectively. The NiCr2O4 NPs showed paramagnetic to ferrimagnetic transition (Tc) at 84 K which is relatively lower than the Tc = 98 K for CoCr2O4 NPs. The temperature dependent Ms value for CoCr2O4 NPs showed deviation from Bloch’s law at low temperatures which may be due to the existence of lock-in and strong conical spin spiral state. NiCr2O4 NPs showed a good Bloch’s law fit with high value of Bloch’s constant B = 0.00183 K−1 and low value of Bloch’s exponent b = 1.23 than their respective bulk value which indicates the presence of disordered surface spins and finite size effect in these NPs. Interestingly, a high value of Hc (5 K) was observed for NiCr2O4 NPs relative to CoCr2O4 NPs which is attributed to the large canted angle between the oxygen and metallic cations in NiCr2O4 NPs. Temperature dependent coercivity (Hc) for both the NPs were fitted with Kneller’s law. The Kneller’s law fit to Hc vs. T data revealed an exponent α = 0.46 for CoCr2O4 NPs which indicates the non-interacting particles with uni-axial symmetry, while it was 0.74 for NiCr2O4 NPs indicating the assembly of randomly oriented particles. In summary, CoCr2O4 and NiCr2O4 NPs showed a different low temperature magnetic response which is also relatively different than counter ferrite NPs. |
| doi_str_mv | 10.1016/j.jmmm.2020.167225 |
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Temperature-dependent magnetic properties of cobalt chromite (CoCr2O4) and nickel chromite (NiCr2O4) nanoparticles (NPs) have been compared by using magnetic measurements. The average particle size of CoCr2O4 and NiCr2O4 NPs deduced from TEM images was found to be 48 and 46 nm, respectively. The NiCr2O4 NPs showed paramagnetic to ferrimagnetic transition (Tc) at 84 K which is relatively lower than the Tc = 98 K for CoCr2O4 NPs. The temperature dependent Ms value for CoCr2O4 NPs showed deviation from Bloch’s law at low temperatures which may be due to the existence of lock-in and strong conical spin spiral state. NiCr2O4 NPs showed a good Bloch’s law fit with high value of Bloch’s constant B = 0.00183 K−1 and low value of Bloch’s exponent b = 1.23 than their respective bulk value which indicates the presence of disordered surface spins and finite size effect in these NPs. Interestingly, a high value of Hc (5 K) was observed for NiCr2O4 NPs relative to CoCr2O4 NPs which is attributed to the large canted angle between the oxygen and metallic cations in NiCr2O4 NPs. Temperature dependent coercivity (Hc) for both the NPs were fitted with Kneller’s law. The Kneller’s law fit to Hc vs. T data revealed an exponent α = 0.46 for CoCr2O4 NPs which indicates the non-interacting particles with uni-axial symmetry, while it was 0.74 for NiCr2O4 NPs indicating the assembly of randomly oriented particles. In summary, CoCr2O4 and NiCr2O4 NPs showed a different low temperature magnetic response which is also relatively different than counter ferrite NPs.</description><identifier>ISSN: 0304-8853</identifier><identifier>EISSN: 1873-4766</identifier><identifier>DOI: 10.1016/j.jmmm.2020.167225</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Chromite ; CoCr2O4 ; Coercivity ; Ferrimagnetism ; Low temperature ; Magnetic measurement ; Magnetic properties ; Multiferroic ; Nanoparticles ; NiCr2O4 ; Size effects ; Temperature dependence</subject><ispartof>Journal of magnetism and magnetic materials, 2020-11, Vol.514, p.167225, Article 167225</ispartof><rights>2020 Elsevier B.V.</rights><rights>Copyright Elsevier BV Nov 15, 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c328t-ed88af66eff8bbcdb87e7a87c8f64a267707e4b779a54fdf8689b933ab26c8d93</citedby><cites>FETCH-LOGICAL-c328t-ed88af66eff8bbcdb87e7a87c8f64a267707e4b779a54fdf8689b933ab26c8d93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Rasool, R. Zohaib</creatorcontrib><creatorcontrib>Nadeem, K.</creatorcontrib><creatorcontrib>Kamran, M.</creatorcontrib><creatorcontrib>Zeb, F.</creatorcontrib><creatorcontrib>Ahmad, Naman</creatorcontrib><creatorcontrib>Mumtaz, M.</creatorcontrib><title>Comparison of anomalous magnetic properties of non-collinear CoCr2O4 and NiCr2O4 nanoparticles</title><title>Journal of magnetism and magnetic materials</title><description>•Tc was high for CoCr2O4 nanoparticles as compared to NiCr2O4.•A high value of Hc was observed for NiCr2O4 nanoparticles.•Larger canted angle increases the Hc value of NiCr2O4 nanoparticles.•NiCr2O4 nanoparticles follow the Bloch’s law with high value of Bloch’s constant and exponent.•CoCr2O4 nanoparticles do not follow Bloch’s law predicted trend.
Temperature-dependent magnetic properties of cobalt chromite (CoCr2O4) and nickel chromite (NiCr2O4) nanoparticles (NPs) have been compared by using magnetic measurements. The average particle size of CoCr2O4 and NiCr2O4 NPs deduced from TEM images was found to be 48 and 46 nm, respectively. The NiCr2O4 NPs showed paramagnetic to ferrimagnetic transition (Tc) at 84 K which is relatively lower than the Tc = 98 K for CoCr2O4 NPs. The temperature dependent Ms value for CoCr2O4 NPs showed deviation from Bloch’s law at low temperatures which may be due to the existence of lock-in and strong conical spin spiral state. NiCr2O4 NPs showed a good Bloch’s law fit with high value of Bloch’s constant B = 0.00183 K−1 and low value of Bloch’s exponent b = 1.23 than their respective bulk value which indicates the presence of disordered surface spins and finite size effect in these NPs. Interestingly, a high value of Hc (5 K) was observed for NiCr2O4 NPs relative to CoCr2O4 NPs which is attributed to the large canted angle between the oxygen and metallic cations in NiCr2O4 NPs. Temperature dependent coercivity (Hc) for both the NPs were fitted with Kneller’s law. The Kneller’s law fit to Hc vs. T data revealed an exponent α = 0.46 for CoCr2O4 NPs which indicates the non-interacting particles with uni-axial symmetry, while it was 0.74 for NiCr2O4 NPs indicating the assembly of randomly oriented particles. In summary, CoCr2O4 and NiCr2O4 NPs showed a different low temperature magnetic response which is also relatively different than counter ferrite NPs.</description><subject>Chromite</subject><subject>CoCr2O4</subject><subject>Coercivity</subject><subject>Ferrimagnetism</subject><subject>Low temperature</subject><subject>Magnetic measurement</subject><subject>Magnetic properties</subject><subject>Multiferroic</subject><subject>Nanoparticles</subject><subject>NiCr2O4</subject><subject>Size effects</subject><subject>Temperature dependence</subject><issn>0304-8853</issn><issn>1873-4766</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LxDAQxYMouK5-AU8Fz13TNE1S8CLFf7C4F70a0nQiKW1Sk67gtzelnj3NMLzfm8dD6LrAuwIX7Lbf9eM47ggm6cA4IdUJ2hSClznljJ2iDS4xzYWoynN0EWOPMS6oYBv00fhxUsFG7zJvMuX8qAZ_jNmoPh3MVmdT8BOE2UJcBM67XPthsA5UyBrfBHKgCeuyV7vuLnkkx4QOEC_RmVFDhKu_uUXvjw9vzXO-Pzy9NPf7XJdEzDl0QijDGBgj2lZ3reDAleBaGEYVYZxjDrTlvFYVNZ0RTNRtXZaqJUyLri636Gb1TWm_jhBn2ftjcOmlJLSiRc0KSpOKrCodfIwBjJyCHVX4kQWWS4-yl0uPculRrj0m6G6FIOX_thBk1Bachs4G0LPsvP0P_wXZs3yH</recordid><startdate>20201115</startdate><enddate>20201115</enddate><creator>Rasool, R. Zohaib</creator><creator>Nadeem, K.</creator><creator>Kamran, M.</creator><creator>Zeb, F.</creator><creator>Ahmad, Naman</creator><creator>Mumtaz, M.</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>20201115</creationdate><title>Comparison of anomalous magnetic properties of non-collinear CoCr2O4 and NiCr2O4 nanoparticles</title><author>Rasool, R. Zohaib ; Nadeem, K. ; Kamran, M. ; Zeb, F. ; Ahmad, Naman ; Mumtaz, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c328t-ed88af66eff8bbcdb87e7a87c8f64a267707e4b779a54fdf8689b933ab26c8d93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Chromite</topic><topic>CoCr2O4</topic><topic>Coercivity</topic><topic>Ferrimagnetism</topic><topic>Low temperature</topic><topic>Magnetic measurement</topic><topic>Magnetic properties</topic><topic>Multiferroic</topic><topic>Nanoparticles</topic><topic>NiCr2O4</topic><topic>Size effects</topic><topic>Temperature dependence</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rasool, R. Zohaib</creatorcontrib><creatorcontrib>Nadeem, K.</creatorcontrib><creatorcontrib>Kamran, M.</creatorcontrib><creatorcontrib>Zeb, F.</creatorcontrib><creatorcontrib>Ahmad, Naman</creatorcontrib><creatorcontrib>Mumtaz, M.</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>Rasool, R. Zohaib</au><au>Nadeem, K.</au><au>Kamran, M.</au><au>Zeb, F.</au><au>Ahmad, Naman</au><au>Mumtaz, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparison of anomalous magnetic properties of non-collinear CoCr2O4 and NiCr2O4 nanoparticles</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2020-11-15</date><risdate>2020</risdate><volume>514</volume><spage>167225</spage><pages>167225-</pages><artnum>167225</artnum><issn>0304-8853</issn><eissn>1873-4766</eissn><abstract>•Tc was high for CoCr2O4 nanoparticles as compared to NiCr2O4.•A high value of Hc was observed for NiCr2O4 nanoparticles.•Larger canted angle increases the Hc value of NiCr2O4 nanoparticles.•NiCr2O4 nanoparticles follow the Bloch’s law with high value of Bloch’s constant and exponent.•CoCr2O4 nanoparticles do not follow Bloch’s law predicted trend.
Temperature-dependent magnetic properties of cobalt chromite (CoCr2O4) and nickel chromite (NiCr2O4) nanoparticles (NPs) have been compared by using magnetic measurements. The average particle size of CoCr2O4 and NiCr2O4 NPs deduced from TEM images was found to be 48 and 46 nm, respectively. The NiCr2O4 NPs showed paramagnetic to ferrimagnetic transition (Tc) at 84 K which is relatively lower than the Tc = 98 K for CoCr2O4 NPs. The temperature dependent Ms value for CoCr2O4 NPs showed deviation from Bloch’s law at low temperatures which may be due to the existence of lock-in and strong conical spin spiral state. NiCr2O4 NPs showed a good Bloch’s law fit with high value of Bloch’s constant B = 0.00183 K−1 and low value of Bloch’s exponent b = 1.23 than their respective bulk value which indicates the presence of disordered surface spins and finite size effect in these NPs. Interestingly, a high value of Hc (5 K) was observed for NiCr2O4 NPs relative to CoCr2O4 NPs which is attributed to the large canted angle between the oxygen and metallic cations in NiCr2O4 NPs. Temperature dependent coercivity (Hc) for both the NPs were fitted with Kneller’s law. The Kneller’s law fit to Hc vs. T data revealed an exponent α = 0.46 for CoCr2O4 NPs which indicates the non-interacting particles with uni-axial symmetry, while it was 0.74 for NiCr2O4 NPs indicating the assembly of randomly oriented particles. In summary, CoCr2O4 and NiCr2O4 NPs showed a different low temperature magnetic response which is also relatively different than counter ferrite NPs.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2020.167225</doi></addata></record> |
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| subjects | Chromite CoCr2O4 Coercivity Ferrimagnetism Low temperature Magnetic measurement Magnetic properties Multiferroic Nanoparticles NiCr2O4 Size effects Temperature dependence |
| title | Comparison of anomalous magnetic properties of non-collinear CoCr2O4 and NiCr2O4 nanoparticles |
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