Underlayers for heat assisted magnetic recording (HAMR) media
View Patent ↗Various embodiments provide for a heat assisted magnetic recording (HAMR) media comprising: a magnetic recording layer; a barrier layer disposed under the magnetic recording layer; a first underlayer disposed under the barrier layer; and an amorphous seedlayer disposed under the first underlayer. For some embodiments, the recording medium may comprise: a magnetic recording layer including FePt alloy, a CoPt alloy, or a FePd alloy; a barrier layer including MgO, TiC, TiN, CrN, TiCN, β-WC, TaC, HfC, ZrC, VC, NbC, or NiO; a first underlayer including RuAl-oxide, NiAl, FeAl, AlMn, CuBe, or AlRe; or an amorphous seedlayer including a Cr—X alloy, where X comprises Al, B, C, Cu, Hf, Ho, Mn, Mo, Ni, Ta, Ti, V, W, or Ru.
1. A recording medium comprising:
a magnetic recording layer;
a barrier layer consisting of TiC disposed under the magnetic recording layer;
a first underlayer disposed under the barrier layer; and
an amorphous seedlayer disposed under the first underlayer;
wherein the magnetic recording layer comprises a FePd alloy;
wherein the first underlayer comprises RuAl-oxide, AIMn, CuBe, or AIRe.
2. The recording medium of claim 1 , further comprising a heatsink layer disposed under the amorphous seedlayer.
3. The recording medium of claim 1 , wherein the magnetic recording layer has a L1 0 crystal structure.
4. The recording medium of claim 1 , wherein the FePd alloy is a FePd—XY alloy, where X comprises Cr 2 O 3 , SiO 2 , TiO 2 , Al 2 O 3 , Ta 2 O 5 , ZrO 2 , Nb 2 O 5 , V 2 O 5 , MgO, MnO, WO 3 , or HfO 2 , and where Y comprises Ni, Cu, Ag, Mn, B, or C.
5. The recording medium of claim 1 , wherein the amorphous seedlayer comprises a Cr—X alloy, where X comprises Al, B, C, Cu, Hf, Ho, Mn, Mo, Ni, Ta, Ti, V, W, or Ru.
6. The recording medium of claim 1 , wherein the recording medium is included in a recording device comprising a housing containing a recording head and the recording medium, the recording head for reading magnetic signals from, and writing magnetic signals to, the recording medium.
7. The recording medium of claim 1 , wherein the barrier layer comprises a material having a B1 structure.