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Evaluation of Interlayer Exchange Coupling in α-Fe(100)/Nd2Fe14B(001) Films
Daisuke Ogawa,Kunihiro Koike,Hiroaki Kato,Shigemi Mizukami,Takamichi Miyazaki,Mikihiko Oogane,Yasuo Ando 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We fabricated α-Fe(100)/Nd2Fe14B(001) bilayer films with different thicknesses values of the-Fe layer on MgO(100) substrates by using an ultra-high-vacuum (UHV) magnetron sputteringsystem. The exchange coupling constant at the heterointerfaces of α-Fe(100)/Nd2Fe14B(001) wasevaluated by analyzing the magnetization curves and the ferromagnetic resonance (FMR) spectra. We observed a significant lower shift of the α-Fe resonance field compared to that of the α-Fe singlelayer irrespective of the Fe-layer thickness, which suggests the existence of an internal field owingto a positive exchange coupling between the -Fe(100) and the Nd2Fe14B(001) layers.
Interface State and Coercivity in Nd-Fe-B/Dy Films
Jin Umezawa,Yoshiki Sakai,Kunihiro Koike,Daisuke Ogawa,Yoshiyuki Mizuno,Hiroaki Kato,Takamichi Miyazaki,Yasuo Ando 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We fabricated a model interface system, which consised of a Nd2Fe14B layer with Dy overlayers,in order to study the relationship between the microstructure near the interface and the coercivity. The coercivity Hc of the 1-µm-thick Nd-Fe-B films with a Dy overlayer was enhanced by thermaldiffusion of Dy atoms from the film’s surface into the Nd-Fe-B layer. The Nd-Fe-B/Dy films annealedat 700℃ showed a significant increase in the Hc of up to about 17 kOe. The maximum increasein the value of the coercivity ΔHc of the annealed films with a Dy overlayer was approximately 13kOe. The XRD measurement suggested the existence of rare-earth oxides (NdO and Dy2O3) in theDy-coated films with high value of the ΔHc.