Chirality-driven intrinsic spin-glass ordering and field-induced ferromagnetism in Ni sub(3)Al nanoparticle aggregates
Weak itinerant-electron ferromagnet Ni sub(3)Al is driven to magnetic instability (quantum critical point, QCP, where the long-range ferromagnetic order of the bulk ceases to exist) by reducing the average crystallite size to d=50 nm. 'Zero-field' (H=0) linear and nonlinear ac-susceptibili...
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Veröffentlicht in: | Journal of magnetism and magnetic materials 2016-03, Vol.401, p.539-558 |
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description | Weak itinerant-electron ferromagnet Ni sub(3)Al is driven to magnetic instability (quantum critical point, QCP, where the long-range ferromagnetic order of the bulk ceases to exist) by reducing the average crystallite size to d=50 nm. 'Zero-field' (H=0) linear and nonlinear ac-susceptibilities, measured on Ni sub(3)Al nanoparticle aggregates, with d=50 nm (S sub(1)) and d=5 nm (S sub(2)), provide strong evidence for two spin glass (SG)-like thermodynamic phase transitions: one at View the MathML source Ti(H=0)[sime]30K (View the MathML source Ti(H=0)[sime]230K) and the other at a lower temperature View the MathML source Tp(H=0)[sime]8K (View the MathML source Th(H=0)[sime]52K) in S sub(1) (S sub(2)). 'In-field' (H[ne]0H[ne]0) linear ac-susceptibility and dc magnetization demonstrate that the thermodynamic nature of these transitions is preserved in finite fields. The presently determined H-T phase diagrams for the samples S sub(1) and S sub(2) are compared with those predicted by the Kotliar-Sompolinsky and Gabay-Toulouse mean-field models and Monte Carlo simulations, based on the chirality-driven spin glass (SG) ordering scenario, for a three-dimensional nearest-neighbor Heisenberg SG system with or without weak random anisotropy. Such a detailed comparison permits us to unambiguously identify various 'zero-field' and 'in-field' SG phase transitions as: (i) the simultaneous paramagnetic (PM)-chiral glass (CG) and PM-SG phase transitions at T sub(i)(H ), (ii) the PM-CG transition at View the MathML source Ti(H), (iii) the replica symmetry-breaking SG transition at T sub(p)(H), and (iv) the continuous spin-rotation symmetry-breaking SG transition at T sub(h)(H). In the presence of random anisotropy, magnetization fails to saturate even at 90 kOe in S sub(1) whereas negligibly small anisotropy allows even fields as weak as 1 kOe to saturate magnetization and induce ferromagnetism in S sub(2). Due to the proximity to CG/SG-QCP, magnetization and susceptibility both exhibit non-Fermi liquid behavior over a wide range at low temperatures. |
doi_str_mv | 10.1016/j.jmmm.2015.10.058 |
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'Zero-field' (H=0) linear and nonlinear ac-susceptibilities, measured on Ni sub(3)Al nanoparticle aggregates, with d=50 nm (S sub(1)) and d=5 nm (S sub(2)), provide strong evidence for two spin glass (SG)-like thermodynamic phase transitions: one at View the MathML source Ti(H=0)[sime]30K (View the MathML source Ti(H=0)[sime]230K) and the other at a lower temperature View the MathML source Tp(H=0)[sime]8K (View the MathML source Th(H=0)[sime]52K) in S sub(1) (S sub(2)). 'In-field' (H[ne]0H[ne]0) linear ac-susceptibility and dc magnetization demonstrate that the thermodynamic nature of these transitions is preserved in finite fields. The presently determined H-T phase diagrams for the samples S sub(1) and S sub(2) are compared with those predicted by the Kotliar-Sompolinsky and Gabay-Toulouse mean-field models and Monte Carlo simulations, based on the chirality-driven spin glass (SG) ordering scenario, for a three-dimensional nearest-neighbor Heisenberg SG system with or without weak random anisotropy. Such a detailed comparison permits us to unambiguously identify various 'zero-field' and 'in-field' SG phase transitions as: (i) the simultaneous paramagnetic (PM)-chiral glass (CG) and PM-SG phase transitions at T sub(i)(H ), (ii) the PM-CG transition at View the MathML source Ti(H), (iii) the replica symmetry-breaking SG transition at T sub(p)(H), and (iv) the continuous spin-rotation symmetry-breaking SG transition at T sub(h)(H). In the presence of random anisotropy, magnetization fails to saturate even at 90 kOe in S sub(1) whereas negligibly small anisotropy allows even fields as weak as 1 kOe to saturate magnetization and induce ferromagnetism in S sub(2). Due to the proximity to CG/SG-QCP, magnetization and susceptibility both exhibit non-Fermi liquid behavior over a wide range at low temperatures.</description><identifier>ISSN: 0304-8853</identifier><identifier>DOI: 10.1016/j.jmmm.2015.10.058</identifier><language>eng</language><subject>Anisotropy ; Ferromagnetism ; Intermetallic compounds ; Intermetallics ; Magnetization ; Nanostructure ; Nickel aluminides ; Phase transformations</subject><ispartof>Journal of magnetism and magnetic materials, 2016-03, Vol.401, p.539-558</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Kaul, S N</creatorcontrib><creatorcontrib>Messala, Umasankar</creatorcontrib><title>Chirality-driven intrinsic spin-glass ordering and field-induced ferromagnetism in Ni sub(3)Al nanoparticle aggregates</title><title>Journal of magnetism and magnetic materials</title><description>Weak itinerant-electron ferromagnet Ni sub(3)Al is driven to magnetic instability (quantum critical point, QCP, where the long-range ferromagnetic order of the bulk ceases to exist) by reducing the average crystallite size to d=50 nm. 'Zero-field' (H=0) linear and nonlinear ac-susceptibilities, measured on Ni sub(3)Al nanoparticle aggregates, with d=50 nm (S sub(1)) and d=5 nm (S sub(2)), provide strong evidence for two spin glass (SG)-like thermodynamic phase transitions: one at View the MathML source Ti(H=0)[sime]30K (View the MathML source Ti(H=0)[sime]230K) and the other at a lower temperature View the MathML source Tp(H=0)[sime]8K (View the MathML source Th(H=0)[sime]52K) in S sub(1) (S sub(2)). 'In-field' (H[ne]0H[ne]0) linear ac-susceptibility and dc magnetization demonstrate that the thermodynamic nature of these transitions is preserved in finite fields. The presently determined H-T phase diagrams for the samples S sub(1) and S sub(2) are compared with those predicted by the Kotliar-Sompolinsky and Gabay-Toulouse mean-field models and Monte Carlo simulations, based on the chirality-driven spin glass (SG) ordering scenario, for a three-dimensional nearest-neighbor Heisenberg SG system with or without weak random anisotropy. Such a detailed comparison permits us to unambiguously identify various 'zero-field' and 'in-field' SG phase transitions as: (i) the simultaneous paramagnetic (PM)-chiral glass (CG) and PM-SG phase transitions at T sub(i)(H ), (ii) the PM-CG transition at View the MathML source Ti(H), (iii) the replica symmetry-breaking SG transition at T sub(p)(H), and (iv) the continuous spin-rotation symmetry-breaking SG transition at T sub(h)(H). In the presence of random anisotropy, magnetization fails to saturate even at 90 kOe in S sub(1) whereas negligibly small anisotropy allows even fields as weak as 1 kOe to saturate magnetization and induce ferromagnetism in S sub(2). Due to the proximity to CG/SG-QCP, magnetization and susceptibility both exhibit non-Fermi liquid behavior over a wide range at low temperatures.</description><subject>Anisotropy</subject><subject>Ferromagnetism</subject><subject>Intermetallic compounds</subject><subject>Intermetallics</subject><subject>Magnetization</subject><subject>Nanostructure</subject><subject>Nickel aluminides</subject><subject>Phase transformations</subject><issn>0304-8853</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqVi7tOAzEQRV2AlPD4ASqXofBix-vELYpAVFTpI7OeOLPyY_F4I_H3bMEPUB3do3sYe1KyU1LtXsZuTCl1W6nMIjpp7A1bSy17Ya3RK3ZHNEopVW93a3Y9XLC6iO1H-IpXyBxzq5gJB04TZhGiI-Klelhs4C57fkaIXmD28wDLglpLciFDQ0pLzj-R0_y10c-vkWeXy-RqwyECdyFUCK4BPbDbs4sEj3-8Z5v3t-PhQ0y1fM9A7ZSQBojRZSgznZTdmt7s5V7rf1x_AT_8Vzo</recordid><startdate>20160301</startdate><enddate>20160301</enddate><creator>Kaul, S N</creator><creator>Messala, Umasankar</creator><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20160301</creationdate><title>Chirality-driven intrinsic spin-glass ordering and field-induced ferromagnetism in Ni sub(3)Al nanoparticle aggregates</title><author>Kaul, S N ; Messala, Umasankar</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_miscellaneous_18254570733</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Anisotropy</topic><topic>Ferromagnetism</topic><topic>Intermetallic compounds</topic><topic>Intermetallics</topic><topic>Magnetization</topic><topic>Nanostructure</topic><topic>Nickel aluminides</topic><topic>Phase transformations</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kaul, S N</creatorcontrib><creatorcontrib>Messala, Umasankar</creatorcontrib><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>Kaul, S N</au><au>Messala, Umasankar</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Chirality-driven intrinsic spin-glass ordering and field-induced ferromagnetism in Ni sub(3)Al nanoparticle aggregates</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2016-03-01</date><risdate>2016</risdate><volume>401</volume><spage>539</spage><epage>558</epage><pages>539-558</pages><issn>0304-8853</issn><abstract>Weak itinerant-electron ferromagnet Ni sub(3)Al is driven to magnetic instability (quantum critical point, QCP, where the long-range ferromagnetic order of the bulk ceases to exist) by reducing the average crystallite size to d=50 nm. 'Zero-field' (H=0) linear and nonlinear ac-susceptibilities, measured on Ni sub(3)Al nanoparticle aggregates, with d=50 nm (S sub(1)) and d=5 nm (S sub(2)), provide strong evidence for two spin glass (SG)-like thermodynamic phase transitions: one at View the MathML source Ti(H=0)[sime]30K (View the MathML source Ti(H=0)[sime]230K) and the other at a lower temperature View the MathML source Tp(H=0)[sime]8K (View the MathML source Th(H=0)[sime]52K) in S sub(1) (S sub(2)). 'In-field' (H[ne]0H[ne]0) linear ac-susceptibility and dc magnetization demonstrate that the thermodynamic nature of these transitions is preserved in finite fields. The presently determined H-T phase diagrams for the samples S sub(1) and S sub(2) are compared with those predicted by the Kotliar-Sompolinsky and Gabay-Toulouse mean-field models and Monte Carlo simulations, based on the chirality-driven spin glass (SG) ordering scenario, for a three-dimensional nearest-neighbor Heisenberg SG system with or without weak random anisotropy. Such a detailed comparison permits us to unambiguously identify various 'zero-field' and 'in-field' SG phase transitions as: (i) the simultaneous paramagnetic (PM)-chiral glass (CG) and PM-SG phase transitions at T sub(i)(H ), (ii) the PM-CG transition at View the MathML source Ti(H), (iii) the replica symmetry-breaking SG transition at T sub(p)(H), and (iv) the continuous spin-rotation symmetry-breaking SG transition at T sub(h)(H). In the presence of random anisotropy, magnetization fails to saturate even at 90 kOe in S sub(1) whereas negligibly small anisotropy allows even fields as weak as 1 kOe to saturate magnetization and induce ferromagnetism in S sub(2). Due to the proximity to CG/SG-QCP, magnetization and susceptibility both exhibit non-Fermi liquid behavior over a wide range at low temperatures.</abstract><doi>10.1016/j.jmmm.2015.10.058</doi></addata></record> |
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subjects | Anisotropy Ferromagnetism Intermetallic compounds Intermetallics Magnetization Nanostructure Nickel aluminides Phase transformations |
title | Chirality-driven intrinsic spin-glass ordering and field-induced ferromagnetism in Ni sub(3)Al nanoparticle aggregates |
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