@article{oai:muroran-it.repo.nii.ac.jp:00008134,
 author = {Nagata,  Shoichi and 永田, 正一 and MIYAZAKI, Masatoshi and 宮崎, 雅年 and 藤田, 英司 and FUJITA, Eiji and Ebisu, Shuji and 戎, 修二 and 山村, 秀美 and YAMAMURA, Hidemi and 谷口, 哲 and TANIGUCHI, Satoshi},
 journal = {室蘭工業大学研究報告. 理工編, Memoirs of the Muroran Institute of Technology. Science and engineering},
 month = {Nov},
 note = {application/pdf, It has been manifestly demonstrated that Gd is one of the best example to be realistically applied to the spin-wave theory of Heisenberg model for the localized magnetic moment. The magnetization of Gd has been measured in the temperature 4<T<310 K at a constant magnetic field of 6 kOe using a homemade vibrating sample magnetometer. We present an exact analysis of the spin-wave excitations for Gd. In the presence of an applied magnetic field, H, an energy gap exists in the spin-wave dispersion relation. As a consequence, the temperature dependence of the magnetization for ferromagnets must differ from the simple Bloch T³/² law. The low temperature magnetization per gram is found to obey the form: Δσ(T)/σ(0) = BZ(3/2,Tℊ/T)T³/² + CZ(5/2, Tℊ/T)T⁵/², where B and C are constants and Δσ(T) = σ(0) - σ(T). The modification factors Z(3/2, Tℊ/T) and Z(5/2, Tℊ/T) are the characteristic functions of T and the magnetic field, H. The spontaneous magnetization of ferromagnetic Gd follows BZ(3/2,Tℊ/T) T³/² relation (the modified Bloch T³/² law) with remarkable fidelity below 200 K.},
 pages = {37--58},
 title = {SPIN-WAVE EXCITATIONS IN Gd AT LOW TEMPERATURES},
 volume = {38},
 year = {1988},
 yomi = {ナガタ, ショウイチ and ミヤザキ, マサトシ and フジタ, エイジ and エビス, シュウジ and ヤマムラ, ヒデミ and タニグチ, サトシ}
}