Magneto-elastic anisotropy assisted thin film structure

• US 8,119,265 B2
• Filed: 11/02/2005
• Issued: 02/21/2012
• Est. Priority Date: 04/01/2005
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Hsia, Yiao-Tee, Peng, Wei, Klemmer, Timothy J.
• Primary Examiner(s): RICKMAN, HOLLY C
• Application Number:
  US11/265,031
• Publication Number:
  US 20060222904A1
• Time in Patent Office: 2,302 Days
• Field of Search: None
• US Class Current: 428/832
• CPC Class Codes: G11B 5/72 Protective coatings, e.g. anti-static or antifriction
• CPC Class Codes: G11B 5/73913 Composites or coated substrates
• CPC Class Codes: G11B 5/73919 Aluminium or titanium elemental or alloy substrates
• CPC Class Codes: G11B 5/73921 Glass or ceramic substrates
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A thin film structure, such as a magnetic recording media, having a magnetic layer and a stress-effecting layer is disclosed. The stress-effecting layer induces a magneto-elastic anisotropy in the magnetic layer. The stress-effecting layer can be activated by the application of an external stress and/or strain. The induced magneto-elastic anisotropy can transiently achieve and/or enhance a tilt angle of the medium. The medium can be a perpendicular magnetic recording medium, a longitudinal magnetic recording medium and/or a tilted magnetic recording medium. The magnetic recording media is suitable for use with a data storage system, such as a HAMR data storage system.

Claims

1. A data storage medium, comprising:

a magnetic recording layer; and

a stress-effecting layer adjacent the magnetic layer, wherein the stress-effecting layer comprises at least one of a magnetostrictive material, a piezoelectric material, a thermal expansion material or an electrostatic material.

2. The data storage medium of claim 1, wherein the magnetostrictive material comprises iron, cobalt, and/or nickel in combination with praseodymium, terbium, samarium, holium, erbium and/or dysprosium.

3. The data storage medium of claim 1, wherein the piezoelectric material comprises quartz crystal, lithium niobates, barium titanate, lead titanate, lead zirconate-lead titanate, meta-lead niobate, and/or polyvinylidenfluoride.

4. The data storage medium of claim 1, wherein the thermal expansion material comprises a shape memory alloy, aluminum, copper, nickel, iron, silver, gold, and/or alloys thereof.

5. The data storage medium of claim 1, wherein the electrostatic material comprises silver, copper, aluminum, tungsten, iron, platinum, managanin, lead and/or alloys thereof.

6. The data storage medium of claim 1, wherein the magnetic layer is a perpendicular magnetic recording layer, a longitudinal magnetic recording layer, or a tilted magnetic recording layer.

7. The data storage medium of claim 1 formed as a data storage medium.

8. The data storage medium of claim 1, wherein the magnetic layer is structured and arranged for data storage.

9. The data storage medium of claim 1, further comprising an additional stress-effecting layer adjacent the magnetic layer.

10. The data storage medium of claim 9, wherein the stress-effecting layer comprises an electrostatic material having a first polarity and the additional stress-effecting layer comprises an electrostatic material having a second polarity, the second polarity being opposite the first polarity.

11. A data storage system, comprising:

a recording head; and

a recording medium positioned adjacent the recording head, the recording medium comprising;

a magnetic layer; and

a stress-effecting layer adjacent the magnetic layer, wherein the stress-effecting layer comprises at least one of a magnetostrictive material, a piezoelectric material, a thermal expansion material or an electrostatic material.

12. The data storage system of claim 11, wherein the magnetic layer is a perpendicular magnetic recording layer, a longitudinal magnetic recording layer, or a tilted magnetic recording layer.

13. The data storage system of claim 11, wherein the magnetic layer is structured and arranged for data storage.

14. The data storage system of claim 11, wherein the recording head is a heat assisted magnetic recording head.

15. The data storage system of claim 11, further comprising an activator in communication with the stress-effecting layer.

16. The data storage system of claim 11, further comprising means for activating the stress-effecting layer.