• Fuchs, Dirk
• Pomjakushina, Ekaterina V.
• Lippert, Thomas
• Biswas, Banani
• Motti, Federico
• Hautle, Patrick
• Stuhr, Uwe
• Bartkowiak, Marek
• Schneider, Christof W.
• Naumov, Pavel

Abstract

<jats:p>In orthoferrites the rare-earth (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>R</a:mi></a:mrow></a:math>) ion has a big impact on structural and magnetic properties; in particular, the ionic size influences the octahedral tilt and the <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:msup><b:mrow><b:mi>R</b:mi></b:mrow><b:mrow><b:mn>3</b:mn><b:mo>+</b:mo></b:mrow></b:msup><b:mtext>−</b:mtext><b:mi mathvariant="normal">F</b:mi><b:msup><b:mrow><b:mi mathvariant="normal">e</b:mi></b:mrow><b:mrow><b:mn>3</b:mn><b:mo>+</b:mo></b:mrow></b:msup></b:mrow></b:math> interaction modifies properties like the spin reorientation. Growth-induced strain in thin films is another means to modify materials properties since the sign of strain affects the bond length and therefore directly the orbital interaction. Our study focuses on epitaxially grown (010)-oriented <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mrow><e:mi>DyFe</e:mi><e:msub><e:mi mathvariant="normal">O</e:mi><e:mn>3</e:mn></e:msub></e:mrow></e:math> and <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"><g:mrow><g:mi>LuFe</g:mi><g:msub><g:mi mathvariant="normal">O</g:mi><g:mn>3</g:mn></g:msub></g:mrow></g:math> thin films, thereby investigating the impact of compressive lattice strain on the magnetically active <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"><i:mrow><i:mi mathvariant="normal">D</i:mi><i:msup><i:mrow><i:mi mathvariant="normal">y</i:mi></i:mrow><i:mrow><i:mn>3</i:mn><i:mo>+</i:mo></i:mrow></i:msup></i:mrow></i:math> and magnetically inactive <l:math xmlns:l="http://www.w3.org/1998/Math/MathML"><l:mrow><l:mi mathvariant="normal">L</l:mi><l:msup><l:mrow><l:mi mathvariant="normal">u</l:mi></l:mrow><l:mrow><l:mn>3</l:mn><l:mo>+</l:mo></l:mrow></l:msup></l:mrow></l:math> compared to uniaxially strained single-crystal <o:math xmlns:o="http://www.w3.org/1998/Math/MathML"><o:mrow><o:mi>DyFe</o:mi><o:msub><o:mi mathvariant="normal">O</o:mi><o:mn>3</o:mn></o:msub></o:mrow></o:math>. The <q:math xmlns:q="http://www.w3.org/1998/Math/MathML"><q:mrow><q:mi>DyFe</q:mi><q:msub><q:mi mathvariant="normal">O</q:mi><q:mn>3</q:mn></q:msub></q:mrow></q:math> films exhibits a shift of more than 20 K in spin-reorientation temperatures, maintain the antiferromagnetic <s:math xmlns:s="http://www.w3.org/1998/Math/MathML"><s:msub><s:mi mathvariant="normal">Γ</s:mi><s:mn>4</s:mn></s:msub></s:math> phase of the Fe lattice below the spin reorientation, and show double-step hysteresis loops for both in-plane directions between 5 and 390 K. This is the signature of an Fe-spin-induced ferromagnetic <u:math xmlns:u="http://www.w3.org/1998/Math/MathML"><u:mrow><u:mi mathvariant="normal">D</u:mi><u:msup><u:mrow><u:mi mathvariant="normal">y</u:mi></u:mrow><u:mrow><u:mn>3</u:mn><u:mo>+</u:mo></u:mrow></u:msup></u:mrow></u:math> lattice above the Néel temperature of the Dy. The observed shift in the film spin reorientation temperatures vs lattice strain is in good agreement with isostatic single-crystal neutron diffraction experiments with a rate of 2 K/kbar.</jats:p><jats:sec><jats:title/><jats:supplementary-material><jats:permissions><jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement><jats:copyright-year>2024</jats:copyright-year></jats:permissions></jats:supplementary-material></jats:sec>

Topics

• impedance spectroscopy
• phase
• experiment
• thin film
• neutron diffraction
• size-exclusion chromatography