Perpendicular heat-assisted magnetic recording (HAMR) medium with a perovskite oxide intermediate layer

Patent metadata

Field	Value
Publication number	US-9530445-B1
Application number	US-201615002543-A
Country	US
Kind code	B1
Filing date	Jan 21, 2016
Priority date	Jan 21, 2016
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A heat-assisted magnetic recording medium has a heat-sink layer, a chemically-ordered FePt alloy magnetic layer and a perovskite oxide intermediate layer between the heat-sink layer and the magnetic layer. The perovskite oxide intermediate layer may function as both a seed layer for the magnetic layer and a thermal barrier layer, as just a seed layer for the magnetic layer, or as just a thermal barrier layer. The intermediate layer is formed of a material selected from a ABO 3 perovskite oxide (where A is selected from one or more of Ba, Sr and Ca and B is selected from one or more of Zr, Ce, Hf, Sn, Ir, and Nb), and a A 2 REBO 6 rare earth double perovskite oxide (where RE is a rare earth element, A is selected from Ba, Sr and Ca, and B is selected from Nb and Ta).

First claim

What is claimed is:

1. A perpendicular magnetic recording medium comprising:
a substrate;
a heat-sink layer on the substrate;
a magnetic layer; and
an intermediate layer between the heat-sink layer and the magnetic layer, the intermediate layer being formed of a material selected from a ABO 3 perovskite oxide, where A is selected from one or more of Ba, Sr and Ca and B is selected from one or more of Zr, Ce, Hf, Sn, Ir and Nb, and a A 2 REBO 6 rare earth double perovskite oxide, where RE is a rare earth element, A is selected from Ba, Sr and Ca, and B is selected from Nb and Ta.

2. The medium of claim 1 wherein the intermediate layer is on and in contact with the heat-sink layer.

3. The medium of claim 1 further comprising a nucleation film selected from Cr, MgO, NiW and NiWCr between the intermediate layer and the heat-sink layer and an amorphous underlayer between the nucleation film and the heat-sink layer.

4. The medium of claim 1 wherein the intermediate layer is BaZrO 3 .

5. The medium of claim 1 wherein the intermediate layer is a seed layer for the magnetic layer and the magnetic layer is on and in contact with the seed layer.

6. The medium of claim 5 wherein the seed layer is a patterned seed layer.

7. The medium of claim 5 wherein the seed layer is a patterned seed layer and the magnetic layer is a bit-patterned magnetic layer.

8. The medium of claim 1 further comprising a nucleation film selected from C, MgO and BN between the magnetic layer and the intermediate layer.

9. The medium of claim 1 wherein the magnetic layer comprises a substantially chemically-ordered pseudo-binary FePtX alloy in the L1 0 phase, where X is one or more of Ni, Au, Cu, Pd, Mn and Ag.

10. The medium of claim 1 wherein the magnetic layer comprises a substantially chemically-ordered alloy comprising Pt and an element selected from Fe and Co, and a segregant selected from one or more of C, SiO 2 , TiO 2 , TaO x , ZrO 2 , SiC, SiN, TiC, TiN, B, BC and BN.

11. The medium of claim 1 wherein the magnetic layer consists of Fe, Pt and C.

12. A heat assisted magnetic recording (HAMR) disk drive comprising:
the medium according to claim 1 wherein said medium is a rotatable HAMR disk; and
a carrier maintained near the magnetic layer of said medium and supporting a near-field transducer.

13. A perpendicular heat-assisted magnetic recording (HAMR) disk comprising:
a substrate;
a heat-sink layer on the substrate;
a seed layer on the heat-sink layer and formed of a material selected from a ABO 3 perovskite oxide, where A is selected from one or more of Ba, Sr and Ca and B is selected from one or more of Zr, Ce, Hf, Sn, Ir and Nb, and a A 2 REBO 6 rare earth double perovskite oxide, where RE is a rare earth element, A is selected from Ba, Sr and Ca, and B is selected from Nb and Ta; and
a magnetic layer of a substantially chemically-ordered alloy comprising Fe and Pt on the seed layer, the magnetic layer further comprising a segregant selected from one or more of C, SiO 2 , TiO 2 , TaO x , ZrO 2 , SiC, SiN, TiC, TiN, B, BC and BN.

14. The disk of claim 13 wherein the seed layer is on and in contact with the heat-sink layer.

15. The disk of claim 13 further comprising a nucleation film selected from Cr, MgO, NiW and NiWCr between the seed layer and the heat-sink layer and an amorphous underlayer between the nucleation film and the heat-sink layer.

16. The disk of claim 13 wherein the magnetic layer is on and in contact with the seed layer.

17. The disk of claim 13 further comprising a nucleation film selected from C, MgO and BN between the magnetic layer and the seed layer.

18. The disk of claim 13 wherein the seed layer is BaZrO 3 .

19. The disk of claim 13 wherein the seed layer is a patterned seed.

20. The disk of claim 13 wherein the magnetic layer comprises a substantially chemically-ordered pseudo-binary FePtX alloy in the L1 0 phase, where X is one or more of Ni, Au, Cu, Pd, Mn and Ag.

Assignees

• HGST Netherlands BV

Inventors

• Grobis Michael Konrad
• Hellwig Olav
• Terris Bruce David
• Wee Sung Hun

Classifications

• G11B5/645

  Physics · mapped topic

• G11B5/653

  containing Fe or Ni (containing Co G11B5/656; containing inorganic, non-oxide compounds of Si, N, P, B, H or C G11B5/657; containing oxygen G11B5/658) · CPC title

• G11B2005/0021

  Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal · CPC title

• G11B5/732

  Physics · mapped topic

• G11B5/40

  Protective measures on heads, e.g. against excessive temperature  (G11B5/31 takes precedence; protection against wear G11B5/255  {; protective structure of the head: see under structures, e.g. G11B5/3106}) · CPC title