{"title":"晶体和相关晶格振动耦合诱导的 Sm2Fe2O5+δ 弱铁磁相互作用","authors":"","doi":"10.1016/j.physb.2024.416501","DOIUrl":null,"url":null,"abstract":"<div><p>There is an increase in demand of the next-generation spintronic devices with stable structural and magnetic properties in varying temperatures. An orthoferrites structure of the <em>Pnma</em> space group has been successfully prepared using high temperature solid-state reaction. In the <span><math><mrow><msub><mtext>Sm</mtext><mn>2</mn></msub><msub><mtext>Fe</mtext><mn>2</mn></msub><msub><mi>O</mi><mrow><mn>5</mn><mo>+</mo><mi>δ</mi></mrow></msub></mrow></math></span> (SFO) material, <span><math><mrow><mi>F</mi><msup><mi>e</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></mrow></math></span> ions occupy edge-cantered and face-cantered positions forming the tilted <span><math><mrow><mtext>Fe</mtext><msub><mi>O</mi><mn>6</mn></msub></mrow></math></span> octahedrons with Glazer's notation tilt <span><math><mrow><msup><mi>a</mi><mo>−</mo></msup><msup><mi>a</mi><mo>−</mo></msup><msup><mi>c</mi><mo>+</mo></msup></mrow></math></span>. The ordering of the rare-earth ions at compensation temperature (<span><math><mrow><mrow><msub><mi>T</mi><mtext>comp</mtext></msub><mo>=</mo><mn>2.3</mn><mspace></mspace><mi>K</mi></mrow><mo>)</mo></mrow></math></span>, spin-flip transition in the range of <span><math><mrow><mn>9.4</mn><mo>−</mo><mn>45.6</mn><mspace></mspace><mi>K</mi></mrow></math></span>, and a second-type spin-reorientation transition around the anisotropy barrier with lower and higher transitional temperatures, <span><math><mrow><msub><mi>T</mi><mi>L</mi></msub><mo>=</mo><mn>465</mn></mrow></math></span> and <span><math><mrow><msub><mi>T</mi><mi>H</mi></msub><mo>=</mo><mn>480</mn><mspace></mspace><mi>K</mi></mrow></math></span> respectively. The canting of spins along with disordered spins at the surface results in a non-zero <span><math><mrow><msub><mi>T</mi><mtext>comp</mtext></msub></mrow></math></span> and unsaturated magnetization. It is inferred that thermal activation of particle's moment over the anisotropy barriers (known as Kneller's law) only occurs above room temperature.</p></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0921452624008421/pdfft?md5=7d5882940a3d3cca79a3c83ffce23e51&pid=1-s2.0-S0921452624008421-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Weak ferromagnetic interactions of Sm2Fe2O5+δ induced by coupling of the crystal and related lattice vibrations\",\"authors\":\"\",\"doi\":\"10.1016/j.physb.2024.416501\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>There is an increase in demand of the next-generation spintronic devices with stable structural and magnetic properties in varying temperatures. An orthoferrites structure of the <em>Pnma</em> space group has been successfully prepared using high temperature solid-state reaction. In the <span><math><mrow><msub><mtext>Sm</mtext><mn>2</mn></msub><msub><mtext>Fe</mtext><mn>2</mn></msub><msub><mi>O</mi><mrow><mn>5</mn><mo>+</mo><mi>δ</mi></mrow></msub></mrow></math></span> (SFO) material, <span><math><mrow><mi>F</mi><msup><mi>e</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></mrow></math></span> ions occupy edge-cantered and face-cantered positions forming the tilted <span><math><mrow><mtext>Fe</mtext><msub><mi>O</mi><mn>6</mn></msub></mrow></math></span> octahedrons with Glazer's notation tilt <span><math><mrow><msup><mi>a</mi><mo>−</mo></msup><msup><mi>a</mi><mo>−</mo></msup><msup><mi>c</mi><mo>+</mo></msup></mrow></math></span>. The ordering of the rare-earth ions at compensation temperature (<span><math><mrow><mrow><msub><mi>T</mi><mtext>comp</mtext></msub><mo>=</mo><mn>2.3</mn><mspace></mspace><mi>K</mi></mrow><mo>)</mo></mrow></math></span>, spin-flip transition in the range of <span><math><mrow><mn>9.4</mn><mo>−</mo><mn>45.6</mn><mspace></mspace><mi>K</mi></mrow></math></span>, and a second-type spin-reorientation transition around the anisotropy barrier with lower and higher transitional temperatures, <span><math><mrow><msub><mi>T</mi><mi>L</mi></msub><mo>=</mo><mn>465</mn></mrow></math></span> and <span><math><mrow><msub><mi>T</mi><mi>H</mi></msub><mo>=</mo><mn>480</mn><mspace></mspace><mi>K</mi></mrow></math></span> respectively. The canting of spins along with disordered spins at the surface results in a non-zero <span><math><mrow><msub><mi>T</mi><mtext>comp</mtext></msub></mrow></math></span> and unsaturated magnetization. It is inferred that thermal activation of particle's moment over the anisotropy barriers (known as Kneller's law) only occurs above room temperature.</p></div>\",\"PeriodicalId\":20116,\"journal\":{\"name\":\"Physica B-condensed Matter\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2024-09-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0921452624008421/pdfft?md5=7d5882940a3d3cca79a3c83ffce23e51&pid=1-s2.0-S0921452624008421-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physica B-condensed Matter\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0921452624008421\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, CONDENSED MATTER\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B-condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921452624008421","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
Weak ferromagnetic interactions of Sm2Fe2O5+δ induced by coupling of the crystal and related lattice vibrations
There is an increase in demand of the next-generation spintronic devices with stable structural and magnetic properties in varying temperatures. An orthoferrites structure of the Pnma space group has been successfully prepared using high temperature solid-state reaction. In the (SFO) material, ions occupy edge-cantered and face-cantered positions forming the tilted octahedrons with Glazer's notation tilt . The ordering of the rare-earth ions at compensation temperature (, spin-flip transition in the range of , and a second-type spin-reorientation transition around the anisotropy barrier with lower and higher transitional temperatures, and respectively. The canting of spins along with disordered spins at the surface results in a non-zero and unsaturated magnetization. It is inferred that thermal activation of particle's moment over the anisotropy barriers (known as Kneller's law) only occurs above room temperature.
期刊介绍:
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces