Abstract
The magnetic properties of Nd-Fe-B thin films with the three different compositions (#1: Nd12.6Fe81.5B5.9, #2: Nd14.6Fe78.1B7.4 and #3: Nd22.6Fe66.2B11.2) are discussed. With increasing Nd content, the c-axis orientation along the film normal is enhanced. It is found that sample #2 possesses the saturation magnetization Ms very close to that for Nd2Fe14B over a temperature range from 100 to about 300K. The magnetic anisotropy constant Ku2 for sample #2 is the highest among those samples, but smaller by about 20%, as compared to that for Nd2Fe14B. It is of interest to note that the temperature TR at which Ku1 changes its sign is lower by about 30K as compared to that previously reported for Nd2Fe14B. The reason for this discrepancy is not clear, but could be due to the presence of the minority phases of Nd-rich compounds and also a possible contribution of the magneto-elastic effect to the net magnetic anisotropy.
Highlights
Thin film permanent magnets have received much attention for various applications including micromechanical devices[1] and magnetoelectronic devices where films of less than 100nm thickness are preferable.[2]
The present paper describes a systematic study of the temperature dependence of the magnetic anisotropy constants Ku1 and Ku2 of Nd-Fe-B thin films
The film-thicknesses for samples #1, 2, and 3 are 84nm, 82nm and 77nm with about 10% accuracy, respectively, which were estimated by inductively coupled plasma (ICP)
Summary
Thin film permanent magnets have received much attention for various applications including micromechanical devices[1] and magnetoelectronic devices where films of less than 100nm thickness are preferable.[2] For such applications, high magnetic anisotropy Ku, high coercivity Hc, high saturation magnetization Ms, high maximum energy product (BH)max and high magnetic hardness (Ku/2πMs2)1/2 are indispensable. Nd-Fe-B magnets are the attractive candidates.[3] much is open for questions regarding their magnetic properties in conjunction with microstructure, especially the magnetic anisotropy. The present paper describes a systematic study of the temperature dependence of the magnetic anisotropy constants Ku1 and Ku2 of Nd-Fe-B thin films
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