You can use Out-Minidump function for PowerShell:
Out-Minidump writes a process dump file with all process memory to disk. This is similar to running procdump.exe with the '-ma' switch.
Basic usage:
Enable PowerShell script execution via Set-ExecutionPolicy cmdlet. It should be Bypass, Unrestricted or RemoteSigned. Details:
If you (or a helpful admin) runs Set-ExecutionPolicy as administrator, the policy will be set for all users. (I would suggest "remoteSigned" rather than "unrestricted" as a safety measure.)
NB.: On a 64-bit OS you need to run Set-ExecutionPolicy for 32-bit and 64-bit PowerShell separately.
Download Out-Minidump.ps1
Unblock it using File properties in Explorer (alternate ways)

Launch PowerShell and dot source function from the Out-Minidump.ps1 (note first dot):
. c:\path\to\Out-Minidump.ps1
- Now you can actually create dump of the process using this syntax:
Get-Process 'notepad.exe' | Out-Minidump -DumpFilePath C:\temp
- To get help, run this command:
Get-Help Out-Minidump -Full