Joo Sungjung, Alemayehu Rekikua Sahilu, Choi Jong-Guk, Park Byong-Guk, Choi Gyung-Min
Center for Electromagnetic Metrology, KRISS, Daejeon 34113, Korea.
Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea.
Materials (Basel). 2021 May 17;14(10):2604. doi: 10.3390/ma14102604.
Metallic ferrimagnets with rare earth-transition metal alloys can provide novel properties that cannot be obtained using conventional ferromagnets. Recently, the compensation point of ferrimagnets, where the net magnetization or net angular momentum vanishes, has been considered a key aspect for memory device applications. For such applications, the magnetic anisotropy energy and damping constant are crucial. In this study, we investigate the magnetic anisotropy and damping constant of a GdCo alloy, with a Gd concentration of 12-27%. By analyzing the equilibrium tilting of magnetization as a function of the applied magnetic field, we estimate the uniaxial anisotropy to be 1-3 × 10 J m. By analyzing the transient dynamics of magnetization as a function of time, we estimate the damping constant to be 0.08-0.22.
含有稀土-过渡金属合金的金属亚铁磁体能够提供一些使用传统铁磁体无法获得的新奇特性。最近，亚铁磁体的补偿点（即净磁化强度或净角动量消失的点）被认为是存储器件应用的一个关键方面。对于此类应用而言，磁各向异性能量和阻尼常数至关重要。在本研究中，我们研究了钆浓度为12%至27%的钆钴合金的磁各向异性和阻尼常数。通过分析作为外加磁场函数的磁化强度平衡倾斜，我们估计单轴各向异性为1 - 3×10焦耳/米。通过分析作为时间函数的磁化强度瞬态动力学，我们估计阻尼常数为0.08 - 0.22。
