• Bertaina, Sylvain
• Assaf, Elie
• Portavoce, Alain
• Bertoglio, Maxime
• Narducci, Dario

Abstract

<jats:title>Abstract</jats:title><jats:p>Magnetic materials may be engineered to produce thermoelectric materials using spin-related effects. However, clear understanding of localized magnetic moments (<jats:italic>µ</jats:italic><jats:sub><jats:italic>I</jats:italic></jats:sub>), free carriers, and Seebeck coefficient (<jats:italic>S</jats:italic>) interrelations is mandatory for efficient material design. In this work, we investigate <jats:italic>µ</jats:italic><jats:sub><jats:italic>I</jats:italic></jats:sub> influence on the spin-dependent <jats:italic>S</jats:italic> of model ferromagnetic thin films, allowing <jats:italic>µ</jats:italic><jats:sub><jats:italic>I</jats:italic></jats:sub> thermal fluctuations, ordering, and density variation influence to be independently investigated. <jats:italic>µ</jats:italic><jats:sub><jats:italic>I</jats:italic></jats:sub> influence on free carrier polarization is found to be of highest importance on <jats:italic>S</jats:italic>: efficient coupling of free carrier spin and localized magnetic moment promotes the increase of <jats:italic>S</jats:italic>, while spin-dependent relaxation time difference between the two spin-dependent conduction channels leads to <jats:italic>S</jats:italic> decrease. Our observations support new routes for thermoelectric material design based on spin-related effects in ferromagnetic materials.</jats:p>

Topics

• density
• impedance spectroscopy
• thin film