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No.2(pp.39-69)

Home > Issues > Volume 4 (1999) > No.2(pp.39-69)

Observations of Exchange Coupling in Nd₂Fe₁₄B/Fe/Nd₂Fe₁₄B Sandwich Structures and Their Magnetic Properties

Journal of Magnetics, Volume 4, Number 2, 30 Jun 1999, Pages 39-45

Choong-Jin Yang(Eletromagnetic Materials Lab., Research Institute of Industrial Science & Technology (RIST)), Sang-Won Kim(Eletromagnetic Materials Lab., Research Institute of Industrial Science & Technology (RIST))

Abstract

Sandwich structures of Nd₂Fe₁₄B/Fe/Nd₂Fe₁₄B magnetic films have been grown by a KrF excimer laser (λ=248 nm) ablation technique. Magnetic properties were characterized by varying the thickness of hard (Nd₂Fe₁₄B) and soft (Fe) magnetic films and the volume fraction as well. In the (x)nm[NdFeB]/(y)nm[Fe]/(x)nm[NdFeB]/(100)Si structure the thickness (x) was varied from 3.6 to 54 nm, and (y) from 15 to 112 nm. At (y) = 15~20 nm where the volume fraction of Fe corresponded to 61~75%, the sandwich structure exhibited an enhanced M_r/M_s and _iH_c as well from the result of the exchange coupling between the magnetic layers. Experimentally calculated exchange constant (As) of A_s=2.5×10^-10 J/m was estimated using the intrinsic coercivity (_iH_c) of 1.2 kOe at 5 K for the sandwich magnetic trilayers.

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