Obtaining of thin films Sr₂FeMoO_6-δ
SFMO films and multilayer structures based on the methods of ion-beam and magnetron sputtering.

Target for sputtering was prepared by conventional method of solid state reaction from oxides and carbonates. SFMO/Al₂O₃/SFMO trilayer structure was deposited onto “Policor” commercial substrates covered with platinum layer. Thickness of upper and lower SFMO electrodes composes 500 nm. Al₂O₃ layer with thickness 8 nm was used as insulating barrier. Pt layers were deposited onto as electrical contacts for transport measurements. Created nanostructures can be used as operating components of a magnetic field sensor. The studies of electrophysical properties of these structures were carried out in temperature range 4-300 К and in transverse magnetic fields up to 12 T.

Sketch of the multilayer heterostructure Sr₂FeMoO_6±δ / Al₂O₃ / Sr₂FeMoO_6±δ.

Optical image of the operating components of a magnetic field sensor.

Field of application:
Magnetic field sensors; highly sensitive information readers; spintronic devices.

Unique characteristic properties:
High Curie temperature (~420 К) provides a possibility of room temperature application of strontium ferromolybdate – based devices at room temperatures. The nature of Sr2FeMoO6 band structure leads to a practically complete spin polarization of charge carriers.

Main technical characteristics:

• Area occupied by one element is 800 μm²;
• Magnetoresistance at temperature 4.2 К in the field of 1 T is 30%;
• Magnetoresistance at temperature 300 К in the field of 1 T is 15%;
• The range of operating currents is 1-1000 μА;
• Saturation magnetic induction in the fields ~1 T.

This development is protected by 2 Patents of Belarus.