论文标题
polycrystalline $ \ mathrm {tb_ {0.15} co_ {0.85}} $中的磁相关性
Magnetic correlations in polycrystalline $\mathrm{Tb_{0.15}Co_{0.85}}$
论文作者
论文摘要
我们通过磁力测定法和小角度散射（SANS）研究了铁磁化合物$ \ mathrm {tb_ {0.15} co_ {0.85}} $的多晶样品。 300 K处的磁化曲线是软铁磁体的特征，但在5 K时，磁滞表示存在磁域。磁性SANS信号表明，在300 K时，TB和CO矩在微米大小的晶粒内的大量晶粒中相关，相关长度> 100 nm。然而，在5 K时，磁性SAN分析显示，相关长度的降低约为4.5 nm，这表明在Ferrimagnet内形成了狭窄的磁性域，其中一个维度在NM范围内。我们将观察到的域结构的变化归因于结核sublattice磁性特性的温度依赖性。
We investigated a polycrystalline sample of the ferrimagnetic compound $\mathrm{Tb_{0.15}Co_{0.85}}$ by magnetometry and small-angle neutron scattering (SANS). The magnetization curve at 300 K is characteristic for soft ferrimagnets but at 5 K the hysteresis indicates the existence of magnetic domains. The magnetic SANS signal suggests that at 300 K the Tb and Co moments are correlated over large volumes within the micrometer-sized grains with correlation lengths > 100 nm. At 5 K, however, the magnetic SANS analysis reveals a reduced correlation length of around 4.5 nm, which indicates the formation of narrow magnetic domains within the ferrimagnet with one dimension being in the nm range. We attribute the observed changes of the domain structure to the temperature-dependence of the magnetic properties of the Tb sublattice.
