Multiaxial magnetocrystalline anisotropy in the X -type hexaferrite Sr2Co2Fe28O46 at low temp

Strain-induced robust magnetic anisotropy and room temperature magnetoelectric coupling effect in epitaxial SmFeO3 film

“…However, traditional theory holds that the two orders have incompatible occupation rules and thus lead to extremely rare multiferroic materials in nature [7]. Recently, spin-induced improper ferroelectricity has been widely explored in some oxide materials [8][9][10][11]. In such systems, the ferroelectric and magnetic orders bind each other and may exhibit strong magnetoelectric (ME) coupling effect.…”

Skyrmion‐Bubble Bundles in an X‐Type Sr2Co2Fe28O46 Hexaferrite above Room Temperature

“…During the magnetic field ( B ) cooling process at B = 10 mT (Figure 1b), the magnetization indicates a Curie temperature of ≈750 K. The magnetizations as a function of the magnetic field (Figure 1c; Figure S2, Supporting Information) suggest that the magnetization easy axis is along the c ‐axis at room temperature and above, which aligns with previous studies. [ 31,34 ] By applying a magnetic field ranging from zero to the saturation field B sat , the total energy provided by the magnetic field can be expressed as $${E}_{\mathrm{B}}=\underset{0}{\overset{{B}_{\mathrm{Sat}}}{\int}}M(B)\mathrm{d}B$$. This energy must surpass both the magnetocrystalline anisotropy energy and the demagnetization energy.…”

“…In this study, we report the discovery of skyrmion-bubble bundles in a centrosymmetric uniaxial magnet known as the X-type Sr 2 Co 2 Fe 28 O 46 (SrCoFeO) hexaferrite. [31][32][33][34] SrCoFeO hexaferrite is a new material candidate that hosts dipolar skyrmions with nanometric-scale sizes (≈150-250 nm) at room temperature. By using reversed magnetic fields, we can create skyrmion-bubble bundles in which various internal skyrmions and bubbles are surrounded by an outer boundary stripe domain.…”

Gallium-substituted X-type hexagonal ferrites Sr2Co2GaxFe28−xO46: effect of substitution and heating temperature on phase formation and magnetic and dielectric properties

“…It is discovered that the MCA is becoming ferroxplana (in the plane of the crystal, out of the c-axis), and it possesses a cone of magnetisation below 340 K and a uniaxial orientation above that temperature. 45,46 In contrast to a uniaxial MCA, where the magnetisation is fixed in one direction along the c-axis and cannot be changed, an in-cone MCA permits the magnetisation to rotate 360 degrees within its cone around the c-axis. For this reason, uniaxial ferrites are magnetically hard (large H C ) and typically have higher MCA, and hence H a and K 1 values, than ferroxplana ferrites with in-plane magnetisation, which are by their nature magnetically soft.…”