Easy plane anisotropy in Bi2CuO4.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Magnetism

Background:

• Understanding the magnetic ordering and anisotropy of materials is crucial for developing advanced electronic and magnetic devices.
• Bismuth cuprate (Bi(2)CuO(4)) is a material with complex magnetic properties that warrant detailed investigation.

Purpose of the Study:

• To experimentally probe the symmetry of the antiferromagnetically (AFM) ordered state in Bi(2)CuO(4).
• To determine the type of magnetic anisotropy present in Bi(2)CuO(4) and quantify its energy constants.

Main Methods:

• Utilized magnetic susceptibility measurements to study the magnetic behavior.
• Employed torque magnetometry to analyze the angular dependence of magnetic anisotropy.
• Applied a phenomenological model to interpret the anisotropy energy.

Main Results:

• The antiferromagnetically ordered state of Bi(2)CuO(4) exhibits easy-plane anisotropy, with the c-plane identified as the easy plane.
• The critical field for spin-flop in the easy plane was estimated to be approximately 15-20 kOe.
• The easy-plane anisotropy energy constant K(22) was determined to be in the range of 27-47×10^3 erg mol(-1).
• The resulting AFM structure consists of two equally populated, mutually perpendicular AFM domains at zero magnetic field.

Conclusions:

• Bi(2)CuO(4) possesses an easy-plane anisotropy, confirming the role of the c-plane in its magnetic ordering.
• The findings provide quantitative values for critical fields and anisotropy constants, essential for theoretical modeling and device applications.
• The presence of two perpendicular AFM domains influences the overall magnetic response of the material.