Magnetic head, hard disk device, and method for transferring two-dimensional atomic crystal layer to head slider of magnetic head

Patent metadata

Field	Value
Publication number	US-2016372141-A1
Application number	US-201615255105-A
Country	US
Kind code	A1
Filing date	Sep 1, 2016
Priority date	Mar 18, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

A magnetic head, including a head slider. The head slider includes a contact surface corresponding to a disk body, and the contact surface is a flat surface. The contact surface is coated with at least one smooth atomic-scale coating formed by a two-dimensional atomic crystal material. The head slider atomically contacts with the disk body.

First claim

The invention claimed is:

1 . A magnetic head, comprising a head slider; wherein the head slider comprises a contact surface corresponding to a disk body, and the contact surface is a flat surface; the contact surface is coated with at least one smooth atomic-scale coating formed by two-dimensional atomic crystal material; and the head slider atomically contacts with the disk body.

2 . The magnetic head of claim 1 , wherein the head slider comprises a side surface which is coated by the coating.

3 . The magnetic head of claim 2 , wherein the two-dimensional atomic crystal material is graphene, boron nitride, boron carbon nitride (BCN), fluorinated graphene, graphene oxide, MoS 2 , WS 2 , MoSe 2 , WSe 2 , MoTe 2 , WTe 2 , ZrS 2 , ZrSe 2 , NbSe 2 , NbS 2 , TaS 2 , TiS 2 , NiSe 2 , GaSe, GaTe, InSe, Bi 2 Se 3 , mica, bismuth strontium calcium copper oxide (BSCCO), MoO 3 , WO 3 , TiO 2 , MnO 2 , V 2 O 5 , TaO 3 , RuO 2 , LaNb 2 O 7 , (Ca, Sr) 2 Nb 3 O 10 , Bi 4 Ti 3 O 12 , Ca 2 Ta 2 TiO 10 , Ni(OH) 2 , Eu(OH) 2 , or layered copper oxide.

4 . The magnetic head of claim 3 , wherein the two-dimensional atomic crystal material is graphene.

5 . The magnetic head of claim 3 , wherein a length and width of the head slider is between 0.1 and 1000 μm.

6 . The magnetic head of claim 5 , wherein the length and width of the head slider is between 10 and 1000 μm.

7 . A hard disk device, comprising: the magnetic head of claim 1 and the disk body;
wherein the disk body comprises a magnetic media layer and at least one protection layer disposed on the magnetic media layer; the protection layer comprises an atomic-scale smooth surface formed by two-dimensional atomic crystal material or diamond-like carbon nanofilm.

8 . The hard disk device of claim 7 , wherein the protection layer comprises the atomic-scale smooth surface formed by diamond-like carbon nanofilm.

9 . The hard disk device of claim 7 , wherein the two-dimensional atomic crystal material of the protection layer is graphene, boron nitride, boron carbon nitride (BCN), fluorinated graphene, graphene oxide, MoS 2 , WS 2 , MoSe 2 , WSe 2 , MoTe 2 , WTe 2 , ZrS 2 , ZrSe 2 , NbSe 2 , NbS 2 , TaS 2 , TiS 2 , NiSe 2 , GaSe, GaTe, InSe, Bi 2 Se 3 , mica, bismuth strontium calcium copper oxide (BSCCO), MoO 3 , WO 3 , TiO 2 , MnO 2 , V 2 O 5 , TaO 3 , RuO 2 , LaNb 2 O 7 , (Ca, Sr) 2 Nb 3 O 10 , Bi 4 Ti 3 O 12 , Ca 2 Ta 2 TiO 10 , Ni(OH) 2 , Eu(OH) 2 , or layered copper oxide.

10 . The hard disk device of claim 7 , wherein when the magnetic head is reading data, the magnetic head atomically contacts with the disk body under an effect of van der Waals force; when a balance of an atomic contact is achieved, the van der Waals force is at a minimum interaction potential.

11 . The hard disk device of claim 9 , wherein the coating of the magnetic head and the protection layer of the disk body use different materials.

12 . The hard disk device of claim 9 , wherein the coating of the magnetic head and the protection layer of the disk body use the same material.

13 . The hard disk device of claim 12 , wherein the head slider is provided with an actuator to change lattice constants of crystal cells of two-dimensional crystals.

14 . The hard disk device of claim 13 , wherein the actuator is a heat emitting device, a piezoelectric device, or a vibration device.

15 . The hard disk device of claim 14 , wherein the actuator is piezoelectric ceramic enabling the head slider to constantly vibrate transversely.

16 . The hard disk device of claim 14 , wherein the hard disk device further comprises a control device; the control device comprises a detection device; the control device actuates the actuator prior to running a read-write device; and during the running of the read-write device, the actuator is actuated when two-dimensional materials of the coating and the protection layer are detected to be commensurately arranged.

17 . A method for transferring a two-dimensional atomic crystal layer on the head slider, comprising:
a. growing a two-dimensional atomic crystal layer on a first matrix; b. coating a second matrix on the two-dimensional atomic crystal layer, and forming a bonding layer between the second matrix and the two-dimensional atomic crystal layer; c. removing the first matrix, and polishing a surface of the head slider which is bonded with the two-dimensional atomic crystal layer to be an atomic-scale smooth surface; and d. bonding the two-dimensional atomic crystal layer to the head slider; and removing the second matrix and the bonding layer to yield the head slider with a two-dimensional atomic crystal coating.

18 . The method of claim 17 , wherein c) comprises removing the first matrix and changing lattice constants of crystal cells of the two-dimensional atomic crystal layer; then the two-dimensional atomic crystal layer having changed lattice constants of crystal cells is bonded to the head slider.

19 . The method of claim 17 , further comprising changing lattice constants of crystal cells of the two-dimensional atomic crystal layer after d).

20 . The method of claim 19 , wherein the lattice constants of crystal cells of the two-dimensional atomic crystal layer are changed through a deformation of the head slider.

21 . The method of claim 20 , wherein the head slider is provided with piezoelectric ceramic to vibrate the head slider constantly and transversely.

22 . A method for preparing a head slider, comprising:
a. allowing two-dimensional crystal material to epitaxially grow on a smooth atomic-scale metal matrix, wherein the metal matrix and the two-dimensional crystal material have different lattice constants; b. integrating the two-dimensional crystal material on the metal matrix and the metal matrix to prepare the head slider; and c. positioning the head slider on a magnetic head.

23 . The method of claim 22 , wherein prior to a), the metal matrix is prepared according to a length and width of the head slider.

24 . The method of claim 22 , wherein after a), the metal matrix on which the two-dimensional crystal material grows is cut to conform to a length and width of the head slider.

Assignees

• Univ Tsinghua

Inventors

• Zheng Quanshui
• Zhang Shoumo

Classifications

• G11B5/3106 Primary

  where the integrated or assembled structure comprises means for conditioning against physical detrimental influence, e.g. wear, contamination (G11B5/3133 takes precedence) · CPC title

• C30B33/10

  in solutions or melts · CPC title

• C01B31/0461

  Chemistry & Metallurgy · mapped topic

• G11B5/6082

  Design of the air bearing surface · CPC title

• C30B25/02

  Epitaxial-layer growth · CPC title