A comparison of FePt thin films with HfO2 or MnO additive

Ejection of boron from L10 phase for sputtered FePt-BN granular films by post-annealing

“…2) For HAMR media, it is necessary to have magnetically isolated fine FePt grains to prevent magnetization reversal due to exchange coupling, and highly ordered columnar FePt grains with cplane sheet texture. In order to achieve these requirements, many studies to add grain boundary materials (GBMs), such as TiO 2 , [3][4][5] C, [6][7][8] MgO, 9) Ta 2 O 5 , 10) B 2 O 3 11) SiO 2 , 12-16) Al 2 O 3 , [17][18][19] Cr 2 O 3 , 20) MnO, 21) WO 3 , 22) AlN, 23) TiN, 24) TaN, 25) ZrO 2 , 26) BN 27,28) into FePt magnetic thin films to separate neighboring magnetic grains and promote the exchange decoupling have been done. According to our previous report, saturation magnetization (M s ) of the granular film depends on the melting point of the GBMs.…”

Magnetic properties and nanostructure of FePt-TiN granular films deposited with N2 gas addition for heat assisted magnetic recording media

“…1) To put HAMR media into practice, there are still a lot of challenges, such as the realization of a granular structure with fine columnar magnetic grains, high caxis orientation, and high degree of order. In order to achieve these requirements, many studies of adding grain boundary materials (GBMs), such as C, 2,3) BN, 4,5) TiN, 6) Si 3 N 4 , 7) AlN, 8) TaN, 9) MnO, 10) HfO 2 , 10) MgO, 11,12) TiO 2 , 13) Ta 2 O 5 , 14) GeO 2 , 15) Al 2 O 3 , 16) Nb 2 O 5 , 17) WO 3 , 17) ZrO 2 , 17,18) Cr 2 O 3 , 19) SiO 2 , 20,21) and B 2 O 3 22) into the FePt sputtered thin films to separate the magnetic grains and promote the exchange decoupling have been conducted. In our study of granular films with various GBMs, we have found that saturation magnetization (M s film ) of the granular film depends on the melting point of the GBMs, which means that M s film of the granular film shows the degree of separation between metal magnetic grains and amorphous GBM.…”

Towards an understanding of microstructure of patterned FePt dots by magnetometry using pulse fields

“…In these fabrication techniques, additives, such as metals [11][12][13][14] and oxide [15][16][17], are usually used to facilitate the L1 0 -ordering and the c-axis perpendicular orientation in the FePt films. However, these additions often make the magnetic and structural analysis complicated after the film patterning.…”