Origin of interface magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 heterostructures.

نویسندگان

  • M Salluzzo
  • S Gariglio
  • D Stornaiuolo
  • V Sessi
  • S Rusponi
  • C Piamonteze
  • G M De Luca
  • M Minola
  • D Marré
  • A Gadaleta
  • H Brune
  • F Nolting
  • N B Brookes
  • G Ghiringhelli
چکیده

Possible ferromagnetism induced in otherwise nonmagnetic materials has been motivating intense research in complex oxide heterostructures. Here we show that a confined magnetism is realized at the interface between SrTiO3 and two insulating polar oxides, BiMnO3 and LaAlO3. By using polarization dependent x-ray absorption spectroscopy, we find that in both cases the magnetism can be stabilized by a negative exchange interaction between the electrons transferred to the interface and local magnetic moments. These local magnetic moments are associated with magnetic Ti3+ ions at the interface itself for LaAlO3/SrTiO3 and to Mn3+ ions in the overlayer for BiMnO3/SrTiO3. In LaAlO3/SrTiO3 the induced magnetism is quenched by annealing in oxygen, suggesting a decisive role of oxygen vacancies in this phenomenon.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Origin of Interface Magnetism in BiMnO 3 / SrTiO 3 and LaAlO 3 / SrTiO 3

Possible ferromagnetism induced in otherwise nonmagnetic materials has been motivating intense research in complex oxide heterostructures. Here we show that a confined magnetism is realized at the interface between SrTiO3 and two insulating polar oxides, BiMnO3 and LaAlO3. By using polarization dependent x-ray absorption spectroscopy, we find that in both cases the magnetism can be stabilized b...

متن کامل

Electric-field-induced Shift in the Threshold Voltage in LaAlO3/SrTiO3 Heterostructures

The two-dimensional electron gas (2DEG) at the interface between insulating LaAlO3 and SrTiO3 is intriguing both as a fundamental science topic and for possible applications in electronics or sensors. For example, because the electrical conductance of the 2DEG at the LaAlO3/SrTiO3 interface can be tuned by applying an electric field, new electronic devices utilizing the 2DEG at the LaAlO3/SrTiO...

متن کامل

Multiorbital structure of the two-dimensional electron gas in LaAlO3/SrTiO3 heterostructures: The formation of a dx y ferromagnetic sheet

We demonstrate the formation of a ferromagnetic two-dimensional dxy electron sheet strictly confined to the TiO2 interface layer in LaAlO3/SrTiO3 heterostructures. Based on first-principles density functional calculations we show that the complex subband structure of the two-dimensional electron gas (2DEG) generated at the LaO/TiO2 (001) interface is universal, and almost independent of the SrT...

متن کامل

Gate-tunable polarized phase of two-dimensional electrons at the LaAlO3/SrTiO3 interface.

Controlling the coupling between localized spins and itinerant electrons can lead to exotic magnetic states. A novel system featuring local magnetic moments and extended 2D electrons is the interface between LaAlO3 and SrTiO3. The magnetism of the interface, however, was observed to be insensitive to the presence of these electrons and is believed to arise solely from extrinsic sources like oxy...

متن کامل

Atomic-resolved depth profile of strain and cation intermixing around LaAlO3/SrTiO3 interfaces

Novel behavior has been observed at the interface of LaAlO3/SrTiO3 heterostructures such as two dimensional metallic conductivity, magnetic scattering and superconductivity. However, both the origins and quantification of such behavior have been complicated due to an interplay of mechanical, chemical and electronic factors. Here chemical and strain profiles near the interface of LaAlO3/SrTiO3 h...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Physical review letters

دوره 111 8  شماره 

صفحات  -

تاریخ انتشار 2013