Improvement of magnetic properties of CoCuPt L 1 1 thin film by Pt(111) underlayer on glass substrate

Sputtering perpendicular magnetic anisotropy CoPt thin film on glass substrate at room temperature

“…3(d), similar to the surface morphology of a single Pt layer on the glass substrate confirmed by SEM. 13 Also, the distinct superstructure From the aforementioned results, the L1 1 phase can be induced at RT by inserting a Pt(111) underlayer due to the epitaxial growth of CoPt(111) grains along flat template provided by Pt(111) layer, while no hard magnetic phase is obtained in the samples without a Pt underlayer. From previous studies, heat treatment is regarded as a necessary step to grow L1 1 phase.…”

“…Recently, a promising new type of material with PMA is rhombohedral CoPt film with L1 1 ordered structure, due to its lower formation temperature (200-300 C) and high magnetocrystalline anisotropy constant (K u $ 10 7 erg/cm 3 ). [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Initially, L1 1 CoPt phase film was obtained on MgO(111) substrate. 1 The effect of Pt content and deposition temperate on K u , PMA, and ordering mechanism for L1 1 structure have been investigated and the results indicate that improved magnetic properties and higher order degree can be obtained as the CoPt film is prepared at around 350 C. 4,5 To further improve magnetic properties of L1 1 phase, doping third element in CoPt film and inserting an underlayer have been carried out.…”

“…[6][7][8][9][10][11] Significant coercivity enhancement and ordering improvement of L1 1 CoPt films were demonstrated by adding Cu element and inserting Pt underlayer, respectively. 9-11 Later high-cost single crystal substrates such as MgO(111) and Al 2 O 3 (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) were replaced by glass and consequently largely increased the applicability of L1 1 CoPt films. [12][13][14][15] From the aforementioned studies, it is concluded that the in-situ heat treatment is necessary for formation of L1 1 CoPt phase.…”

“…9-11 Later high-cost single crystal substrates such as MgO(111) and Al 2 O 3 (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) were replaced by glass and consequently largely increased the applicability of L1 1 CoPt films. [12][13][14][15] From the aforementioned studies, it is concluded that the in-situ heat treatment is necessary for formation of L1 1 CoPt phase. However, this method has to spend not only the thermal annealing energy but also long time for substrate cooling to ambient temperature, which induces grain growth during film deposition.…”

“…The insufficient volume is probable to hinder the formation of PMA behavior in [Co 1.0 /Pt 0.75 ] 2 /Pt/glass. 13 The H c? and S ?…”